minor: index page correction

Author: Sam Kleinman

source/index.txt

@@ -99,5 +99,5 @@ The following resources provide additional information:
 - `MongoDB Events <http://www.mongodb.org/events/>`_
 - `Planet MongoDB <http://planet.mongodb.org/>`_
 - `Slides and Video <http://www.10gen.com/presentations/>`_
-- `MongoDB Monitoring Service <http://mms.10gen.com/>`_ (`MMS Help docs <http://mms.10gen.com/help/>`_)
+- `MongoDB Monitoring Service <http://mms.10gen.com/>`_ (`MMS documentation <http://mms.10gen.com/help/>`_)
 - `MongoDB Books <http://10gen.com/books/>`_