Update messenger.rst

Co-authored-by: Oskar Stark <[email protected]>

Author: sylfabre

messenger.rst

@@ -456,7 +456,6 @@ With the following code and configuration, messages will be dispatched like this
 
 .. code-block::php
 
-    <?php
     $messageBus->dispatch(new Notification());
     $messageBus->dispatch(new SmsNotification());