correct tag name.

Author: makasim

Diff for: docs/bundle/message_processor.md

@@ -15,7 +15,7 @@ services:
   app.async.say_hello_processor:
     class: 'AppBundle\Async\SayHelloProcessor'
     tags:
-        - { name: 'enqueue.client.message_processor', topicName: 'aTopic' }
+        - { name: 'enqueue.client.processor', topicName: 'aTopic' }
 
 ```
 
@@ -74,8 +74,8 @@ services:
   app.async.say_hello_processor:
     class: 'AppBundle\Async\SayHelloProcessor'
     tags:
-        - { name: 'enqueue.client.message_processor'}
+        - { name: 'enqueue.client.processor'}
 
 ```
 
-[back to index](../index.md)
+[back to index](../index.md)