Updated URL to upgrade guide.

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@8013 b35dd754-fafc-0310-a699-88a17e54d16e

documentation/docs/index.html

@@ -31,8 +31,8 @@ messaging (IM) services using the XMPP protocol.
         How to install Openfire.
     </li>
     <li>
-        <a href="http://wiki.igniterealtime.org/display/WILDFIRE/Wildfire+Upgrade+Guide">Upgrade Guide</a> -
-        Instructions for upgrading an existing Openfire installation.
+        <a href="http://wiki.igniterealtime.org/display/WILDFIRE/Wildfire+to+Openfire+Upgrade+Guide">Upgrade Guide</a> -
+        Instructions for upgrading an existing Wildfire installation into an Openfire installation.
     </li>
     <li>
         <a href="database.html">Database Installation Guide</a> -