Merge branch '6.1' into 6.2

* 6.1:
  Minor

Author: OskarStark

notifier.rst

@@ -729,7 +729,7 @@ typical alert levels, which you can implement immediately using:
 
         # config/services.yaml
         services:
-            notifier.flash_message_importance_mapper: 
+            notifier.flash_message_importance_mapper:
                 class: Symfony\Component\Notifier\FlashMessage\BootstrapFlashMessageImportanceMapper
 
     .. code-block:: xml