MB-10270: Point menu item to new forum location

Change-Id: Iccf4d70164d25f538fc67824c3170ea1669875a3
Reviewed-on: http://review.couchbase.org/34494
Reviewed-by: Jens Alfke <jens@couchbase.com>
Tested-by: Bin Cui <bin.cui@gmail.com>