Update links to Cocoon.

git-svn-id: https://svn.apache.org/repos/asf/xml/commons/trunk@226075 13f79535-47bb-0310-9956-ffa450edef68

src/documentation/content/xdocs/site.xml

@@ -38,13 +38,13 @@
 
   <external-refs>
     <xml.apache.org href="http://xml.apache.org/">
-      <cocoon href="cocoon/">
-        <catalogs href="userdocs/concepts/catalog.html"/>
-      </cocoon>
       <commons href="commons/">
       </commons>
       <forrest href="forrest/"/>
     </xml.apache.org>
+    <cocoon href="http://cocoon.apache.org/2.1/">
+      <catalogs href="userdocs/concepts/catalog.html"/>
+    </cocoon>
   </external-refs>
 
 </site>