diff --git a/core/modules/system/theme.api.php b/core/modules/system/theme.api.php
index 137f6e25430ce97d7c087671e7c1be85ec8183a9..4dd9d6058f2c5e52d7283bac55feca0ae0d60c6d 100644
--- a/core/modules/system/theme.api.php
+++ b/core/modules/system/theme.api.php
@@ -18,16 +18,16 @@
  * @link theme_render Theme system and Render API topic @endlink for more
  * information about render arrays and rendering.
  *
- * @section sec_theme_hooks Theme Hooks The theme system is invoked in
- * drupal_render() by calling the internal _theme() function, which operates on
- * the concept of "theme hooks". Theme hooks define how a particular type of
- * data should be rendered. They are registered by modules by implenting
- * hook_theme(), which specifies the name of the hook, the input "variables"
- * used to provide data and options, and other information. Modules implementing
- * hook_theme() also need to provide a default implementation for each of their
- * theme hooks, normally in a Twig file, and they may also provide preprocessing
- * functions. For example, the core Search module defines a theme hook for a
- * search result item in search_theme():
+ * @section sec_theme_hooks Theme Hooks
+ * The theme system is invoked in drupal_render() by calling the internal
+ * _theme() function, which operates on the concept of "theme hooks". Theme
+ * hooks define how a particular type of data should be rendered. They are
+ * registered by modules by implenting hook_theme(), which specifies the name of
+ * the hook, the input "variables" used to provide data and options, and other
+ * information. Modules implementing hook_theme() also need to provide a default
+ * implementation for each of their theme hooks, normally in a Twig file, and
+ * they may also provide preprocessing functions. For example, the core Search
+ * module defines a theme hook for a search result item in search_theme():
  * @code
  * return array(
  *   'search_result' => array(