MB-9152:  comment out mention of voltron revision

Change-Id: Id40885858528e573d7537e6cbbc555a2e693cda1
Reviewed-on: http://review.couchbase.org/29123
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>