Docs: Add a missing summary and `@since` version to the DocBlock for `WP_MS_Sites_List_Table::prepare_items()`.

Also adds a changelog entry for 4.6.0 noting the changeover to `get_sites()`.

Fixes #36675. See #21837, #24833 and #33185.


git-svn-id: https://develop.svn.wordpress.org/trunk@37739 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/class-wp-ms-sites-list-table.php

@@ -59,6 +59,10 @@ class WP_MS_Sites_List_Table extends WP_List_Table {
 	}
 
 	/**
+	 * Prepares the list of sites for display.
+	 *
+	 * @since 3.1.0
+	 * @since 4.6.0 Converted to use get_sites()
 	 *
 	 * @global string $s
 	 * @global string $mode