Issue #2607870 by Lars Toomre: Some docblock fixes for PHP type 'integer'

core/lib/Drupal/Component/Gettext/PoHeader.php

core/lib/Drupal/Core/Database/Connection.php

core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php

core/lib/Drupal/Core/Entity/Element/EntityAutocomplete.php

...ib/Drupal/Core/Entity/Plugin/DataType/EntityReference.php

core/lib/Drupal/Core/Template/TwigTransTokenParser.php

core/lib/Drupal/Core/TypedData/Plugin/DataType/Timestamp.php

core/modules/comment/src/Tests/CommentNonNodeTest.php

core/modules/comment/src/Tests/CommentTestBase.php

.../contact/src/Tests/Migrate/MigrateContactCategoryTest.php

.../content_translation/src/FieldTranslationSynchronizer.php

..._translation/src/Tests/ContentTranslationSyncUnitTest.php

...c/Tests/EntityReference/EntityReferenceFileUploadTest.php

core/modules/field/src/Tests/Migrate/d7/MigrateFieldTest.php

...odules/file/src/Plugin/migrate/destination/EntityFile.php

core/modules/file/src/Tests/Migrate/d6/MigrateFileTest.php

core/modules/file/src/Tests/Migrate/d7/MigrateFileTest.php

core/modules/help/src/Tests/HelpTest.php

core/modules/language/src/Entity/ConfigurableLanguage.php

core/modules/locale/src/StringBase.php