remove empty lines at end of help text

rssbot.py

@@ -94,9 +94,7 @@ Invite me to any room on {homeserver} and use the custom state event <code>de.ev
       "update_interval_secs": 10
     }}
   ]
-}}
-</code>
-""".format(homeserver=self.client.user_id.split(':')[1])
+}}</code>""".format(homeserver=self.client.user_id.split(':')[1])
 
             room.send_html(help_message)