trivial: spacing fix for rendering issue

Author: kay-kim

source/index.txt

@@ -92,7 +92,6 @@ Support
 -------
 
 Community Support
-
    You can get help with MongoDB through various community-supported
    forums, such as `Stack Overflow`_ as well as our `mailing list
    <https://groups.google.com/forum/#!forum/mongodb-user>`_ and `Slack