trivial fix on homepage

Author: kay-kim

source/index.txt

@@ -140,7 +140,7 @@ Additional Resources
       documentation <https://docs.opsmanager.mongodb.com/current/?jmp=docs>`_.
 
    |mms-home|
-      A free cloud-based service for monitoring and backing up MongoDB
+      A cloud-based service for monitoring and backing up MongoDB
       deployments. Also consider the |mms-docs|.
 
    `MongoDB Ecosystem <http://docs.mongodb.org/ecosystem/?jmp=docs>`_