Docs: Document the usage of `$wp_widget_factory` global in `WP_Customize_Widgets::sanitize_widget_instance()`.

Follow-up to [50996].

Props jontyravi, audrasjb.
Fixes #53394.
Built from https://develop.svn.wordpress.org/trunk@51141


git-svn-id: http://core.svn.wordpress.org/trunk@50750 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-customize-widgets.php

@@ -1395,6 +1395,8 @@ final class WP_Customize_Widgets {
 	 *
 	 * @since 3.9.0
 	 *
+	 * @global WP_Widget_Factory $wp_widget_factory
+	 *
 	 * @param array $value Widget instance to sanitize.
 	 * @param string $id_base Base of the ID of the widget being sanitized.
 	 * @return array|void Sanitized widget instance.

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.8-beta1-51140';
+$wp_version = '5.8-beta1-51141';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.