website; clarify where help is available

index.jade

@@ -53,7 +53,7 @@ html(lang='en')
         ul
           li irc: #mongoosejs on freenode
           li
-            a(href="http://groups.google.com/group/mongoose-orm") google group
+            a(href="http://groups.google.com/group/mongoose-orm") help forum
           li
             a(href="https://github.com/learnboost/mongoose/issues/") bug reports
           li