fixed doc index template url

Author: robertoschwald

audit-logging/src/docs/templates/index.tmpl

@@ -90,7 +90,7 @@
 
   <h2>Current Documentation</h2>
   <ul>
-    <li><a href="/grails-audit-logging-plugin/latest/index.html">User guide</a></li>
+    <li><a href="/grails-audit-logging-plugin/latest/plugin.html">User guide</a></li>
     <li><a href="/grails-audit-logging-plugin/latest/audit-logging-@[email protected]">User guide PDF</a></li>
     <li><a href="/grails-audit-logging-plugin/latest/audit-logging-@[email protected]">User guide EPUB</a></li>
   </ul>