List --killMessage at the end

Although argparse should be smart enough to handle this in any order, 
it's generally easier for us poor humans to read the arguments if the 
unstructured one is the last argument. Re-order the listing to make this 
clearer.

killstream/kill_stream.py

@@ -31,9 +31,8 @@ Taultulli > Settings > Notification Agents > New Script > Script Arguments:
 
  Select: Playback Start, Playback Pause
  Arguments: --jbop SELECTOR --userId {user_id} --username {username}
-            --sessionId {session_id}
+            --sessionId {session_id} --notify notifierID
             --killMessage Your message here. No quotes.
-            --notify notifierID
 
  Save
  Close
@@ -176,11 +175,11 @@ if __name__ == "__main__":
                         help='The username of the person streaming.')
     parser.add_argument('--sessionId', required=True,
                         help='The unique identifier for the stream.')
-    parser.add_argument('--killMessage', nargs='+',
-                        help='Message to send to user whose stream is killed.')
     parser.add_argument('--notify', type=int,
                         help='Notification Agent ID number to Agent to send ' +
                              'notification.')
+    parser.add_argument('--killMessage', nargs='+',
+                        help='Message to send to user whose stream is killed.')
 
     opts = parser.parse_args()