Fix minor formatting issues

docs/source/development/messaging.txt

@@ -125,8 +125,8 messages upon deserialization to the following form for convenience::
       # but the Python implementation copies them to the top level.
       'msg_id' : uuid,
       'msg_type' : str,
-      'parent_header' : dict
-      'content' : dict
+      'parent_header' : dict,
+      'content' : dict,
     }
 
 All messages sent to or received by any IPython process should have this
@@ -554,7 +554,7 Message type: ``object_info_reply``::
     # that no source was found.
     'source' : str,
     }
-'
+
     
 Complete
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