Update notifier.rst

fixed typo

Author: knallcharge

notifier.rst

@@ -903,7 +903,7 @@ is dispatched. Listeners receive a
         $message = $event->getOriginalMessage();
 
         // log something
-        $this->logger(sprintf('The message has been successfully sent and have id: %s, $message->getMessageId()'));
+        $this->logger(sprintf('The message has been successfully sent and has id: %s, $message->getMessageId()'));
     });
 
 .. TODO