Issue #2380573 by tibbsa: Add @return $this to ConfigInstallerInterface::setSynching

core/lib/Drupal/Core/Config/ConfigInstallerInterface.php

@@ -71,6 +71,8 @@ public function resetSourceStorage();
    *
    * @param bool $status
    *   The status of the sync flag.
+   *
+   * @return $this
    */
   public function setSyncing($status);