Merge branch '5.2' into 5.x

* 5.2:
  Remove personal e-mailaddress from the code example

Author: wouterj

notifier.rst

@@ -530,7 +530,7 @@ sent using the Slack transport::
                 ->content('You got a new invoice for 15 EUR.')
                 ->importance(Notification::IMPORTANCE_HIGH);
 
-            $notifier->send($notification, new Recipient('wouter@wouterj.nl'));
+            $notifier->send($notification, new Recipient('wouter@example.com'));
 
             // ...
         }