Additional fix for issue ietf-tools#1950, removing the double slash.

 - Legacy-Id: 11106

Author: levkowetz

ietf/templates/group/group_about.html

@@ -135,7 +135,7 @@
       <tr>
 	 <th>Jabber chat</th>
         <th>Room address</th>
-        <td><a href="xmpp://{{ group.acronym }}@jabber.ietf.org?join">xmpp://{{ group.acronym }}@jabber.ietf.org?join</a></td>
+        <td><a href="xmpp:{{ group.acronym }}@jabber.ietf.org?join">xmpp:{{ group.acronym }}@jabber.ietf.org?join</a></td>
       </tr>
 
       <tr>