diff --git a/core/modules/block/src/Plugin/migrate/source/Block.php b/core/modules/block/src/Plugin/migrate/source/Block.php
index 273f95059a2e1b2d81adc1b778f557528735da5a..a6bc1313be207a3635ccb9d44efa66aaf992d253 100644
--- a/core/modules/block/src/Plugin/migrate/source/Block.php
+++ b/core/modules/block/src/Plugin/migrate/source/Block.php
@@ -8,9 +8,10 @@
 // cspell:ignore whois
 
 /**
- * Drupal block source from database.
+ * Drupal 6/7 block source from database.
+ *
+ * For available configuration keys, refer to the parent classes.
  *
- * For available configuration keys, refer to the parent classes:
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/block/src/Plugin/migrate/source/d6/BlockTranslation.php b/core/modules/block/src/Plugin/migrate/source/d6/BlockTranslation.php
index 007c25d28946778fc0d06e9e0019920d320e3bc4..6cfa1d6ffcd6041fc67d9159f3dbd5587717344f 100644
--- a/core/modules/block/src/Plugin/migrate/source/d6/BlockTranslation.php
+++ b/core/modules/block/src/Plugin/migrate/source/d6/BlockTranslation.php
@@ -7,9 +7,10 @@
 use Drupal\migrate\Row;
 
 /**
- * Gets i18n block data from source database.
+ * Drupal 6 i18n block data from database.
+ *
+ * For available configuration keys, refer to the parent classes.
  *
- * For available configuration keys, refer to the parent classes:
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/block/src/Plugin/migrate/source/d7/BlockTranslation.php b/core/modules/block/src/Plugin/migrate/source/d7/BlockTranslation.php
index 132599357b6d6ef90611713e62d9e2e38b6a6cf8..8eb01c8015ccb515dd5cbfe3dec9cab95ae8072e 100644
--- a/core/modules/block/src/Plugin/migrate/source/d7/BlockTranslation.php
+++ b/core/modules/block/src/Plugin/migrate/source/d7/BlockTranslation.php
@@ -5,9 +5,10 @@
 use Drupal\block\Plugin\migrate\source\Block;
 
 /**
- * Gets i18n block data from source database.
+ * Drupal 7 i18n block data from database.
+ *
+ * For available configuration keys, refer to the parent classes.
  *
- * For available configuration keys, refer to the parent classes:
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/block_content/src/Plugin/migrate/source/d6/Box.php b/core/modules/block_content/src/Plugin/migrate/source/d6/Box.php
index 1e8a88d471ee89d83f0b2914effb19a4467d57a0..f264f20892277b66172fd4f6ae204091e67680be 100644
--- a/core/modules/block_content/src/Plugin/migrate/source/d6/Box.php
+++ b/core/modules/block_content/src/Plugin/migrate/source/d6/Box.php
@@ -7,7 +7,8 @@
 /**
  * Drupal 6 block source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/block_content/src/Plugin/migrate/source/d6/BoxTranslation.php b/core/modules/block_content/src/Plugin/migrate/source/d6/BoxTranslation.php
index 50685e3b3dad4dfb5211562f5f33d5abeaace9fb..234af073c01bd900fe3a3c86a2bb10fd499e80c3 100644
--- a/core/modules/block_content/src/Plugin/migrate/source/d6/BoxTranslation.php
+++ b/core/modules/block_content/src/Plugin/migrate/source/d6/BoxTranslation.php
@@ -5,9 +5,10 @@
 use Drupal\block_content\Plugin\migrate\source\d7\BlockCustomTranslation as D7BlockCustomTranslation;
 
 /**
- * Gets Drupal 6 i18n custom block translations from database.
+ * Drupal 6 i18n custom block translations source from database.
+ *
+ * For available configuration keys, refer to the parent classes.
  *
- * For available configuration keys, refer to the parent classes:
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/block_content/src/Plugin/migrate/source/d7/BlockCustom.php b/core/modules/block_content/src/Plugin/migrate/source/d7/BlockCustom.php
index 4b9c5e89cca8345ffa856491c6c979b6d59d56fe..70a0711f4030c95d67660f15831019b175d17155 100644
--- a/core/modules/block_content/src/Plugin/migrate/source/d7/BlockCustom.php
+++ b/core/modules/block_content/src/Plugin/migrate/source/d7/BlockCustom.php
@@ -7,7 +7,8 @@
 /**
  * Drupal 7 custom block source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/block_content/src/Plugin/migrate/source/d7/BlockCustomTranslation.php b/core/modules/block_content/src/Plugin/migrate/source/d7/BlockCustomTranslation.php
index a297ff3cea8c662c090767cef1beac9a26d613c6..8298a0ee939efde1c3340667d1b3635e0cbf8a31 100644
--- a/core/modules/block_content/src/Plugin/migrate/source/d7/BlockCustomTranslation.php
+++ b/core/modules/block_content/src/Plugin/migrate/source/d7/BlockCustomTranslation.php
@@ -7,9 +7,10 @@
 use Drupal\content_translation\Plugin\migrate\source\I18nQueryTrait;
 
 /**
- * Gets Drupal 7 i18n custom block translations from database.
+ * Drupal 7 i18n custom block translations source from database.
+ *
+ * For available configuration keys, refer to the parent classes.
  *
- * For available configuration keys, refer to the parent classes:
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/config_translation/src/Plugin/migrate/source/d6/ProfileFieldTranslation.php b/core/modules/config_translation/src/Plugin/migrate/source/d6/ProfileFieldTranslation.php
index 2ccb43cb6106dbf6a8d9ad08f5006c9057c588fe..11215b4403eeed58fe0715a4347515e9ae1ece54 100644
--- a/core/modules/config_translation/src/Plugin/migrate/source/d6/ProfileFieldTranslation.php
+++ b/core/modules/config_translation/src/Plugin/migrate/source/d6/ProfileFieldTranslation.php
@@ -7,7 +7,8 @@
 /**
  * Drupal 6 i18n strings profile field source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/field/src/Plugin/migrate/source/d6/Field.php b/core/modules/field/src/Plugin/migrate/source/d6/Field.php
index 4ebec8b7e7e4cdb162b50a864435b35f29ec6e20..2a49e391e08a971f9f33e359f59941b2f535d39f 100644
--- a/core/modules/field/src/Plugin/migrate/source/d6/Field.php
+++ b/core/modules/field/src/Plugin/migrate/source/d6/Field.php
@@ -8,7 +8,8 @@
 /**
  * Drupal 6 field source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/field/src/Plugin/migrate/source/d6/FieldInstance.php b/core/modules/field/src/Plugin/migrate/source/d6/FieldInstance.php
index ed302ea6dbbacc5de4fc62eb30af359a16b52905..66f24fd2237fd49ae523ba8251cf09d9b322d325 100644
--- a/core/modules/field/src/Plugin/migrate/source/d6/FieldInstance.php
+++ b/core/modules/field/src/Plugin/migrate/source/d6/FieldInstance.php
@@ -26,7 +26,8 @@
  * In this example field instances of type page are retrieved from the source
  * database.
  *
- * For additional configuration keys, refer to the parent classes:
+ * For additional configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/field/src/Plugin/migrate/source/d6/FieldInstanceOptionTranslation.php b/core/modules/field/src/Plugin/migrate/source/d6/FieldInstanceOptionTranslation.php
index 505aa1c9aafb73f2986063527ce6b4538ad06eca..c0f58b78e5007959ed226a7624540e794fac3f6f 100644
--- a/core/modules/field/src/Plugin/migrate/source/d6/FieldInstanceOptionTranslation.php
+++ b/core/modules/field/src/Plugin/migrate/source/d6/FieldInstanceOptionTranslation.php
@@ -5,7 +5,8 @@
 /**
  * Drupal 6 i18n field instance option labels source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/field/src/Plugin/migrate/source/d6/FieldInstancePerFormDisplay.php b/core/modules/field/src/Plugin/migrate/source/d6/FieldInstancePerFormDisplay.php
index 438b2198e613c8d580c20026936c8da302dc7444..9112e9a63ee39dc64ebd040b964adcab71309ec9 100644
--- a/core/modules/field/src/Plugin/migrate/source/d6/FieldInstancePerFormDisplay.php
+++ b/core/modules/field/src/Plugin/migrate/source/d6/FieldInstancePerFormDisplay.php
@@ -7,7 +7,8 @@
 /**
  * Drupal 6 field instance per form display source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/field/src/Plugin/migrate/source/d6/FieldInstancePerViewMode.php b/core/modules/field/src/Plugin/migrate/source/d6/FieldInstancePerViewMode.php
index b571991084bcf0d1a6b1f37ffd720eefafc0ce41..62b4e3d36854c55461c3e725c97a6e3ae6149df7 100644
--- a/core/modules/field/src/Plugin/migrate/source/d6/FieldInstancePerViewMode.php
+++ b/core/modules/field/src/Plugin/migrate/source/d6/FieldInstancePerViewMode.php
@@ -7,7 +7,8 @@
 /**
  * Drupal 6 field instance per view mode source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/field/src/Plugin/migrate/source/d6/FieldLabelDescriptionTranslation.php b/core/modules/field/src/Plugin/migrate/source/d6/FieldLabelDescriptionTranslation.php
index 81edff92090ee78e52408797f5608122406df486..51382e6cc6fcd9cda5fad15bf4459b43df4880f2 100644
--- a/core/modules/field/src/Plugin/migrate/source/d6/FieldLabelDescriptionTranslation.php
+++ b/core/modules/field/src/Plugin/migrate/source/d6/FieldLabelDescriptionTranslation.php
@@ -7,7 +7,8 @@
 /**
  * Drupal 6 i18n field label and description source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/field/src/Plugin/migrate/source/d6/FieldOptionTranslation.php b/core/modules/field/src/Plugin/migrate/source/d6/FieldOptionTranslation.php
index 94aaeb43682c5c0f9d35bb7758d9b82c7045dadb..325a27e8baa3e7c9671f5c03c7aa9f4d839fb27c 100644
--- a/core/modules/field/src/Plugin/migrate/source/d6/FieldOptionTranslation.php
+++ b/core/modules/field/src/Plugin/migrate/source/d6/FieldOptionTranslation.php
@@ -5,7 +5,8 @@
 /**
  * Drupal 6 i18n field option labels source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/field/src/Plugin/migrate/source/d7/Field.php b/core/modules/field/src/Plugin/migrate/source/d7/Field.php
index ae71d7dde0ff9a13fd1d5f91b714acb2d201bade..f978146afba9e8b87c7af34882995a9c7ce4d2b6 100644
--- a/core/modules/field/src/Plugin/migrate/source/d7/Field.php
+++ b/core/modules/field/src/Plugin/migrate/source/d7/Field.php
@@ -12,7 +12,8 @@
  * migrated. The values of those fields will be migrated to the base fields they
  * were replacing.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/field/src/Plugin/migrate/source/d7/FieldInstance.php b/core/modules/field/src/Plugin/migrate/source/d7/FieldInstance.php
index 572f6142b1113bbab943ee4baf2ed164823dee6a..713cf2b87266a800de560d9d764b5821e0490d92 100644
--- a/core/modules/field/src/Plugin/migrate/source/d7/FieldInstance.php
+++ b/core/modules/field/src/Plugin/migrate/source/d7/FieldInstance.php
@@ -41,7 +41,8 @@
  * In this example field instances of page content type are retrieved from the
  * source database.
  *
- * For additional configuration keys, refer to the parent classes:
+ * For additional configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/field/src/Plugin/migrate/source/d7/FieldInstancePerFormDisplay.php b/core/modules/field/src/Plugin/migrate/source/d7/FieldInstancePerFormDisplay.php
index 0ea30440a3545514a5a26e5d58c695368483cb09..e1f999718f8887a101cd988bbf63cbc172e76874 100644
--- a/core/modules/field/src/Plugin/migrate/source/d7/FieldInstancePerFormDisplay.php
+++ b/core/modules/field/src/Plugin/migrate/source/d7/FieldInstancePerFormDisplay.php
@@ -5,7 +5,8 @@
 /**
  * Drupal 7 field instance per form display source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\field\Plugin\migrate\source\d7\FieldInstance
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
diff --git a/core/modules/field/src/Plugin/migrate/source/d7/FieldInstancePerViewMode.php b/core/modules/field/src/Plugin/migrate/source/d7/FieldInstancePerViewMode.php
index 9e38bb247d7aa3aaf007e500fb6acda3b2b0d733..44a0b42ec41b298e4f032b0464466cda6767904a 100644
--- a/core/modules/field/src/Plugin/migrate/source/d7/FieldInstancePerViewMode.php
+++ b/core/modules/field/src/Plugin/migrate/source/d7/FieldInstancePerViewMode.php
@@ -5,7 +5,8 @@
 /**
  * Drupal 7 field instance per view mode source class.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\field\Plugin\migrate\source\d7\FieldInstance
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
diff --git a/core/modules/field/src/Plugin/migrate/source/d7/FieldLabelDescriptionTranslation.php b/core/modules/field/src/Plugin/migrate/source/d7/FieldLabelDescriptionTranslation.php
index 1ea718af50a2803b698e2db52f75a79dfa9024e3..bec150fe78e3b323a4e41886be806224bc487533 100644
--- a/core/modules/field/src/Plugin/migrate/source/d7/FieldLabelDescriptionTranslation.php
+++ b/core/modules/field/src/Plugin/migrate/source/d7/FieldLabelDescriptionTranslation.php
@@ -7,7 +7,8 @@
 /**
  * Drupal 7 i18n field label and description source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/field/src/Plugin/migrate/source/d7/FieldOptionTranslation.php b/core/modules/field/src/Plugin/migrate/source/d7/FieldOptionTranslation.php
index 5569541d2d43f5590500595a2bcf65526aa4a9ab..b7159b31d4fea107d3119905155415404324b95e 100644
--- a/core/modules/field/src/Plugin/migrate/source/d7/FieldOptionTranslation.php
+++ b/core/modules/field/src/Plugin/migrate/source/d7/FieldOptionTranslation.php
@@ -5,7 +5,8 @@
 /**
  * Drupal 7 i18n field option label source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/language/src/Plugin/migrate/source/Language.php b/core/modules/language/src/Plugin/migrate/source/Language.php
index 9576cf7a79db939aff90e9fc5868cbd77d20e32b..870f9790e6591efcdd54bb1a434c558041130a20 100644
--- a/core/modules/language/src/Plugin/migrate/source/Language.php
+++ b/core/modules/language/src/Plugin/migrate/source/Language.php
@@ -6,7 +6,7 @@
 use Drupal\migrate_drupal\Plugin\migrate\source\DrupalSqlBase;
 
 /**
- * Drupal language source from database.
+ * Drupal 6/7 language source from database.
  *
  * Available configuration keys:
  * - fetch_all: (optional) If not empty, all source languages are retrieved and
@@ -28,7 +28,8 @@
  * Given that fetch_all and domain_negotiation are specified, each row also
  * contains all languages and the domain negotiation status, if enabled.
  *
- * For additional configuration keys, refer to the parent classes:
+ * For additional configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/language/src/Plugin/migrate/source/d6/LanguageContentSettings.php b/core/modules/language/src/Plugin/migrate/source/d6/LanguageContentSettings.php
index 9fbe85c831f3117e9f86cef7c8fe22d081b32770..d2f4c8b342b1cfc2b6064a68d57dd2ca2f4767af 100644
--- a/core/modules/language/src/Plugin/migrate/source/d6/LanguageContentSettings.php
+++ b/core/modules/language/src/Plugin/migrate/source/d6/LanguageContentSettings.php
@@ -8,7 +8,8 @@
 /**
  * Drupal 6 i18n node settings from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBas
  *
diff --git a/core/modules/language/src/Plugin/migrate/source/d6/LanguageContentSettingsTaxonomyVocabulary.php b/core/modules/language/src/Plugin/migrate/source/d6/LanguageContentSettingsTaxonomyVocabulary.php
index 246e635ddf2b16fcde459fb35f87def7567dce91..4eddde832ec42d497eef48f76360151a26b94024 100644
--- a/core/modules/language/src/Plugin/migrate/source/d6/LanguageContentSettingsTaxonomyVocabulary.php
+++ b/core/modules/language/src/Plugin/migrate/source/d6/LanguageContentSettingsTaxonomyVocabulary.php
@@ -8,7 +8,8 @@
 /**
  * Drupal 6 i18n vocabularies source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBas
  *
diff --git a/core/modules/language/src/Plugin/migrate/source/d7/LanguageContentSettings.php b/core/modules/language/src/Plugin/migrate/source/d7/LanguageContentSettings.php
index 6ce9283c5186980e4a53248cf341be7c36897e9b..ae0b11409d3e075a597162d522ac979993e7148f 100644
--- a/core/modules/language/src/Plugin/migrate/source/d7/LanguageContentSettings.php
+++ b/core/modules/language/src/Plugin/migrate/source/d7/LanguageContentSettings.php
@@ -8,7 +8,8 @@
 /**
  * Drupal 7 i18n node settings from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBas
  *
diff --git a/core/modules/language/src/Plugin/migrate/source/d7/LanguageContentSettingsTaxonomyVocabulary.php b/core/modules/language/src/Plugin/migrate/source/d7/LanguageContentSettingsTaxonomyVocabulary.php
index 9017a9e461d5b5d4ca253b67894ef7ad8359fa39..89622ab5b0100f7078a7e2a6db995ad6f75060b5 100644
--- a/core/modules/language/src/Plugin/migrate/source/d7/LanguageContentSettingsTaxonomyVocabulary.php
+++ b/core/modules/language/src/Plugin/migrate/source/d7/LanguageContentSettingsTaxonomyVocabulary.php
@@ -7,7 +7,8 @@
 /**
  * Drupal 7 i18n vocabularies source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBas
  *
diff --git a/core/modules/menu_link_content/src/Plugin/migrate/source/MenuLink.php b/core/modules/menu_link_content/src/Plugin/migrate/source/MenuLink.php
index 271517442b7c9dd2689b19a48dcfb86204bf17b2..1101ce6be64356f0e7f1ecfbd01e5473be76fade 100644
--- a/core/modules/menu_link_content/src/Plugin/migrate/source/MenuLink.php
+++ b/core/modules/menu_link_content/src/Plugin/migrate/source/MenuLink.php
@@ -7,7 +7,7 @@
 use Drupal\migrate\Row;
 
 /**
- * Drupal menu link source from database.
+ * Drupal 6/7 menu link source from database.
  *
  * Available configuration keys:
  * - menu_name: (optional) The menu name(s) to filter menu links from the source
diff --git a/core/modules/menu_link_content/src/Plugin/migrate/source/d6/MenuLinkTranslation.php b/core/modules/menu_link_content/src/Plugin/migrate/source/d6/MenuLinkTranslation.php
index 54b20687342bdbec786c73dc7d9f4bdf685adc90..863e5bee494ad35d7d455a17d9df7caf05484a2e 100644
--- a/core/modules/menu_link_content/src/Plugin/migrate/source/d6/MenuLinkTranslation.php
+++ b/core/modules/menu_link_content/src/Plugin/migrate/source/d6/MenuLinkTranslation.php
@@ -7,7 +7,7 @@
 use Drupal\menu_link_content\Plugin\migrate\source\MenuLink;
 
 /**
- * Gets Menu link translations from source database.
+ * Drupal 6 i18n menu link translations source from database.
  *
  * @MigrateSource(
  *   id = "d6_menu_link_translation",
diff --git a/core/modules/menu_link_content/src/Plugin/migrate/source/d7/MenuLinkLocalized.php b/core/modules/menu_link_content/src/Plugin/migrate/source/d7/MenuLinkLocalized.php
index b683186cea1b9cd5a4c8f25e3df13cce355f03eb..0b9e5ce30f1c27349a0a8858b3ed4089378a885e 100644
--- a/core/modules/menu_link_content/src/Plugin/migrate/source/d7/MenuLinkLocalized.php
+++ b/core/modules/menu_link_content/src/Plugin/migrate/source/d7/MenuLinkLocalized.php
@@ -6,7 +6,7 @@
 use Drupal\migrate\Row;
 
 /**
- * Gets localized menu link translations from source database.
+ * Drupal 7 localized menu link translations source from database.
  *
  * @MigrateSource(
  *   id = "d7_menu_link_localized",
diff --git a/core/modules/menu_link_content/src/Plugin/migrate/source/d7/MenuLinkTranslation.php b/core/modules/menu_link_content/src/Plugin/migrate/source/d7/MenuLinkTranslation.php
index b55a1a218f57ed6e7f08fa12527ee880be38c455..267e896b9bcad6637ea9f42186eb117b1233a2b9 100644
--- a/core/modules/menu_link_content/src/Plugin/migrate/source/d7/MenuLinkTranslation.php
+++ b/core/modules/menu_link_content/src/Plugin/migrate/source/d7/MenuLinkTranslation.php
@@ -7,7 +7,7 @@
 use Drupal\menu_link_content\Plugin\migrate\source\MenuLink;
 
 /**
- * Gets Menu link translations from source database.
+ * Drupal 7 i18n menu link translations source from database.
  *
  * @MigrateSource(
  *   id = "d7_menu_link_translation",
diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/source/DrupalSqlBase.php b/core/modules/migrate_drupal/src/Plugin/migrate/source/DrupalSqlBase.php
index 54cce94105510b77a65e34627af9892a5cafadf6..428bfd2b42cdbb37ff76b0cf6e99df7dc0617ed5 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/source/DrupalSqlBase.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/source/DrupalSqlBase.php
@@ -22,7 +22,8 @@
  *
  * For a full list, refer to the methods of this class.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  */
diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/source/Variable.php b/core/modules/migrate_drupal/src/Plugin/migrate/source/Variable.php
index 62f4f6f0249a2f3ab05460aae19376d0b1770479..0b83a099afb226ccbb65854d7dfa51fb53ac6faa 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/source/Variable.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/source/Variable.php
@@ -7,7 +7,7 @@
 use Drupal\migrate\Plugin\MigrationInterface;
 
 /**
- * Drupal variable source from database.
+ * Drupal 6/7 variable source from database.
  *
  * This source class fetches variables from the source Drupal database.
  * Depending on the configuration, this returns zero or a single row and as such
@@ -70,7 +70,8 @@
  *     - book_allowed_types
  * @endcode
  *
- * For additional configuration keys, refer to the parent classes:
+ * For additional configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/source/VariableMultiRow.php b/core/modules/migrate_drupal/src/Plugin/migrate/source/VariableMultiRow.php
index 0f9f0ac57091e81cc8e7981b6de92568f742187c..ee9b6268ebbf400697e7b0b0caa0eec9e82a6219 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/source/VariableMultiRow.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/source/VariableMultiRow.php
@@ -7,7 +7,7 @@
 // cspell:ignore multirow
 
 /**
- * Multiple variables source from database.
+ * Drupal 6/7 multiple variables source from database.
  *
  * Unlike the variable source plugin, this one returns one row per
  * variable.
@@ -29,7 +29,8 @@
  * In this example the specified variables are retrieved from the source
  * database one row per variable.
  *
- * For additional configuration keys, refer to the parent classes:
+ * For additional configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/source/d6/VariableTranslation.php b/core/modules/migrate_drupal/src/Plugin/migrate/source/d6/VariableTranslation.php
index ad55192bf7b1947a121bcee37fb1b55aa8dcb7af..11323f4bf7a0c7eb8201425ef70fcff768b5f9fe 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/source/d6/VariableTranslation.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/source/d6/VariableTranslation.php
@@ -9,7 +9,7 @@
 use Drupal\migrate_drupal\Plugin\migrate\source\DrupalSqlBase;
 
 /**
- * Drupal i18n_variable source from database.
+ * Drupal 6 i18n_variable source from database.
  *
  * Available configuration keys:
  * - variables: (required) The list of variable translations to retrieve from
@@ -25,7 +25,8 @@
  * In this example the translations for site_offline_message variable are
  * retrieved from the source database.
  *
- * For additional configuration keys, refer to the parent classes:
+ * For additional configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/source/d7/FieldableEntity.php b/core/modules/migrate_drupal/src/Plugin/migrate/source/d7/FieldableEntity.php
index 6e28632d0d668032cd345f669947a374ec135755..176749480b5478fe9ab3f35947af739c1d0eedd2 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/source/d7/FieldableEntity.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/source/d7/FieldableEntity.php
@@ -12,7 +12,8 @@
  * @see \Drupal\node\Plugin\migrate\source\d7\Node
  * @see \Drupal\user\Plugin\migrate\source\d7\User
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  */
diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/source/d7/VariableTranslation.php b/core/modules/migrate_drupal/src/Plugin/migrate/source/d7/VariableTranslation.php
index fe55c782ec14dce56ba1ff6613cfde850669250d..56121db822ac8a641c714a271c06d49f1ae68b81 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/source/d7/VariableTranslation.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/source/d7/VariableTranslation.php
@@ -8,7 +8,7 @@
 use Drupal\migrate_drupal\Plugin\migrate\source\DrupalSqlBase;
 
 /**
- * Gets Drupal variable_store source from database.
+ * Drupal 7 variable_store source from database.
  *
  * Available configuration keys:
  * - variables: (required) The list of variable translations to retrieve from
@@ -25,7 +25,8 @@
  * In this example the translations for site_name and site_slogan variables are
  * retrieved from the source database.
  *
- * For additional configuration keys, refer to the parent classes:
+ * For additional configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/source/d8/Config.php b/core/modules/migrate_drupal/src/Plugin/migrate/source/d8/Config.php
index 5aba90f2acdf14f996f06d035f036b9e2f9a0a0b..16b545c0fc8bcb099c9257a9ec1e28f5341b3377 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/source/d8/Config.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/source/d8/Config.php
@@ -42,7 +42,8 @@
  * As a result, French versions of specified configuration objects are retrieved
  * from the source database.
  *
- * For additional configuration keys, refer to the parent classes:
+ * For additional configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/node/src/Plugin/migrate/source/d7/NodeEntityTranslation.php b/core/modules/node/src/Plugin/migrate/source/d7/NodeEntityTranslation.php
index ca61c6c563a05013346544e064c217629c391953..d9ea90c3739d07da0d15eb9f5e33e3031a4a6a9f 100644
--- a/core/modules/node/src/Plugin/migrate/source/d7/NodeEntityTranslation.php
+++ b/core/modules/node/src/Plugin/migrate/source/d7/NodeEntityTranslation.php
@@ -6,7 +6,7 @@
 use Drupal\migrate_drupal\Plugin\migrate\source\d7\FieldableEntity;
 
 /**
- * Provides Drupal 7 node entity translations source plugin.
+ * Drupal 7 node entity translations source from database.
  *
  * Available configuration keys:
  * - node_type: The node_types to get from the source - can be a string or
diff --git a/core/modules/taxonomy/src/Plugin/migrate/source/d6/TermLocalizedTranslation.php b/core/modules/taxonomy/src/Plugin/migrate/source/d6/TermLocalizedTranslation.php
index 6fd6a1ce4e057a8dbfa4e802c7a86fee1b8caeb7..57397c62bca9ec69c85dc5cb70167acd0a9f2168 100644
--- a/core/modules/taxonomy/src/Plugin/migrate/source/d6/TermLocalizedTranslation.php
+++ b/core/modules/taxonomy/src/Plugin/migrate/source/d6/TermLocalizedTranslation.php
@@ -5,7 +5,7 @@
 use Drupal\migrate\Row;
 
 /**
- * Drupal 6 i18n taxonomy terms from source database.
+ * Drupal 6 i18n taxonomy terms source from database.
  *
  * For available configuration keys, refer to the parent classes.
  *
diff --git a/core/modules/taxonomy/src/Plugin/migrate/source/d6/VocabularyTranslation.php b/core/modules/taxonomy/src/Plugin/migrate/source/d6/VocabularyTranslation.php
index 294da00e31874c1e4a27aae686b89109d26bdfcd..617daf7e4730dbf363e707a4bf76778a1ebda510 100644
--- a/core/modules/taxonomy/src/Plugin/migrate/source/d6/VocabularyTranslation.php
+++ b/core/modules/taxonomy/src/Plugin/migrate/source/d6/VocabularyTranslation.php
@@ -6,7 +6,7 @@
 use Drupal\migrate_drupal\Plugin\migrate\source\DrupalSqlBase;
 
 /**
- * Drupal 6 i18n vocabulary translations from source database.
+ * Drupal 6 i18n vocabulary translations source from database.
  *
  * For available configuration keys, refer to the parent classes.
  *
diff --git a/core/modules/taxonomy/src/Plugin/migrate/source/d7/TermLocalizedTranslation.php b/core/modules/taxonomy/src/Plugin/migrate/source/d7/TermLocalizedTranslation.php
index a06ec0d138c60446e4f25f1476121c33e86aa801..43d5cfaaf4a22a5d4e930bad9d548f1ccc1e62ec 100644
--- a/core/modules/taxonomy/src/Plugin/migrate/source/d7/TermLocalizedTranslation.php
+++ b/core/modules/taxonomy/src/Plugin/migrate/source/d7/TermLocalizedTranslation.php
@@ -6,7 +6,7 @@
 use Drupal\migrate\Row;
 
 /**
- * Drupal 7 i18n taxonomy terms from source database.
+ * Drupal 7 i18n taxonomy terms source from database.
  *
  * For available configuration keys, refer to the parent classes.
  *
diff --git a/core/modules/taxonomy/src/Plugin/migrate/source/d7/TermTranslation.php b/core/modules/taxonomy/src/Plugin/migrate/source/d7/TermTranslation.php
index 15ad5dfe9534ab5b82b6d33c248fe584707ec74e..c58dba0731ee6ee51cd5d5e27e96de8927596911 100644
--- a/core/modules/taxonomy/src/Plugin/migrate/source/d7/TermTranslation.php
+++ b/core/modules/taxonomy/src/Plugin/migrate/source/d7/TermTranslation.php
@@ -5,7 +5,7 @@
 use Drupal\migrate\Row;
 
 /**
- * Drupal 7 i18n taxonomy terms from source database.
+ * Drupal 7 i18n taxonomy terms source from database.
  *
  * For available configuration keys, refer to the parent classes.
  *
diff --git a/core/modules/user/src/Plugin/migrate/source/ProfileField.php b/core/modules/user/src/Plugin/migrate/source/ProfileField.php
index ce40c399afb1d80e4fc0b9d6d5c536a5f6b2a493..db87a26fc15e816ad529480b78cbff6b30bceb89 100644
--- a/core/modules/user/src/Plugin/migrate/source/ProfileField.php
+++ b/core/modules/user/src/Plugin/migrate/source/ProfileField.php
@@ -7,9 +7,10 @@
 use Drupal\migrate\Row;
 
 /**
- * Profile field source from database.
+ * Drupal 6/7 profile field source from database.
+ *
+ * For available configuration keys, refer to the parent classes.
  *
- * For available configuration keys, refer to the parent classes:
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/user/src/Plugin/migrate/source/UserPictureInstance.php b/core/modules/user/src/Plugin/migrate/source/UserPictureInstance.php
index 591cc441e5a30836203444a4c8cc0358b03d9331..cd4f0b00ac1c125e7c153bbb1b20a8a9424d8612 100644
--- a/core/modules/user/src/Plugin/migrate/source/UserPictureInstance.php
+++ b/core/modules/user/src/Plugin/migrate/source/UserPictureInstance.php
@@ -6,9 +6,10 @@
 use Drupal\migrate\Plugin\migrate\source\DummyQueryTrait;
 
 /**
- * User picture field instance source from database.
+ * Drupal 6/7 user picture field instance source from database.
+ *
+ * For available configuration keys, refer to the parent classes.
  *
- * For available configuration keys, refer to the parent classes:
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/user/src/Plugin/migrate/source/d6/ProfileFieldOptionTranslation.php b/core/modules/user/src/Plugin/migrate/source/d6/ProfileFieldOptionTranslation.php
index b74fb5e260e1fac637f703d6bb1f5b2288957cf3..41c384876521aa548f0649b43882f198d8455e52 100644
--- a/core/modules/user/src/Plugin/migrate/source/d6/ProfileFieldOptionTranslation.php
+++ b/core/modules/user/src/Plugin/migrate/source/d6/ProfileFieldOptionTranslation.php
@@ -7,7 +7,8 @@
 /**
  * Drupal 6 i18n profile field option labels source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/user/src/Plugin/migrate/source/d6/ProfileFieldValues.php b/core/modules/user/src/Plugin/migrate/source/d6/ProfileFieldValues.php
index f73aa059d44a0fa5e48a27a823166ba5e616ddf5..8445be5cc3f8ab898335790aefad3a857c345618 100644
--- a/core/modules/user/src/Plugin/migrate/source/d6/ProfileFieldValues.php
+++ b/core/modules/user/src/Plugin/migrate/source/d6/ProfileFieldValues.php
@@ -8,7 +8,8 @@
 /**
  * Drupal 6 profile fields values source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/user/src/Plugin/migrate/source/d6/Role.php b/core/modules/user/src/Plugin/migrate/source/d6/Role.php
index 6be90ea8e75205e4422cefc2e60b9bcd2e65beaa..26cdc5408215a14c11c61bcba93be2690ed6ba98 100644
--- a/core/modules/user/src/Plugin/migrate/source/d6/Role.php
+++ b/core/modules/user/src/Plugin/migrate/source/d6/Role.php
@@ -8,7 +8,8 @@
 /**
  * Drupal 6 role source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/user/src/Plugin/migrate/source/d6/User.php b/core/modules/user/src/Plugin/migrate/source/d6/User.php
index b4e5b9b73ac5ed1ee773bae01ce99668177ea0b3..da30f3fc988ccd63451116b45706f50252c5cb0d 100644
--- a/core/modules/user/src/Plugin/migrate/source/d6/User.php
+++ b/core/modules/user/src/Plugin/migrate/source/d6/User.php
@@ -8,7 +8,8 @@
 /**
  * Drupal 6 user source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/user/src/Plugin/migrate/source/d6/UserPicture.php b/core/modules/user/src/Plugin/migrate/source/d6/UserPicture.php
index c32a77385da647b6148963945f644046afe55d8d..cd52c7bd20c87ce40c70ad5020f1b85203784c16 100644
--- a/core/modules/user/src/Plugin/migrate/source/d6/UserPicture.php
+++ b/core/modules/user/src/Plugin/migrate/source/d6/UserPicture.php
@@ -7,7 +7,8 @@
 /**
  * Drupal 6 user picture source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/user/src/Plugin/migrate/source/d6/UserPictureFile.php b/core/modules/user/src/Plugin/migrate/source/d6/UserPictureFile.php
index 60e38e8e4dde1090d9690e0adf6a873f6935403d..02ba6163f6bcdd10811e1b85e840009f1e99276d 100644
--- a/core/modules/user/src/Plugin/migrate/source/d6/UserPictureFile.php
+++ b/core/modules/user/src/Plugin/migrate/source/d6/UserPictureFile.php
@@ -12,7 +12,8 @@
  * - site_path: (optional) The path to the site directory relative to Drupal
  *   root. Defaults to 'sites/default'.
  *
- * For additional configuration keys, refer to the parent classes:
+ * For additional configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/user/src/Plugin/migrate/source/d7/Role.php b/core/modules/user/src/Plugin/migrate/source/d7/Role.php
index 2939cd9549861464edc17999dd1450d6d6865f7d..d07842058a60e1040735053baf876ad3318b583c 100644
--- a/core/modules/user/src/Plugin/migrate/source/d7/Role.php
+++ b/core/modules/user/src/Plugin/migrate/source/d7/Role.php
@@ -8,7 +8,8 @@
 /**
  * Drupal 7 role source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/user/src/Plugin/migrate/source/d7/User.php b/core/modules/user/src/Plugin/migrate/source/d7/User.php
index e92ae14e5fac73ebc5926a8090455b8313f0384b..286857a6b6b8a78c77f5ef8fa11c31ecc77488d5 100644
--- a/core/modules/user/src/Plugin/migrate/source/d7/User.php
+++ b/core/modules/user/src/Plugin/migrate/source/d7/User.php
@@ -8,7 +8,8 @@
 /**
  * Drupal 7 user source from database.
  *
- * For available configuration keys, refer to the parent classes:
+ * For available configuration keys, refer to the parent classes.
+ *
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *
diff --git a/core/modules/user/src/Plugin/migrate/source/d7/UserEntityTranslation.php b/core/modules/user/src/Plugin/migrate/source/d7/UserEntityTranslation.php
index 067f86b6950edc179b511e4b49fdf79fff94bd34..04c6cead822e36f6bdad3c20111b89c7b1395e81 100644
--- a/core/modules/user/src/Plugin/migrate/source/d7/UserEntityTranslation.php
+++ b/core/modules/user/src/Plugin/migrate/source/d7/UserEntityTranslation.php
@@ -6,9 +6,10 @@
 use Drupal\migrate_drupal\Plugin\migrate\source\d7\FieldableEntity;
 
 /**
- * Provides Drupal 7 user entity translations source plugin.
+ * Drupal 7 user entity translations source from database.
+ *
+ * For available configuration keys, refer to the parent classes.
  *
- * For available configuration keys, refer to the parent classes:
  * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
  * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
  *