[MB-10281]: Updated README_for_zip.txt

Change-Id: Id45f9b72e1f7bbf80139461beaf9550aed690d37
Reviewed-on: http://review.couchbase.org/34816
Reviewed-by: Eric Limare <eric.limare@couchbase.com>
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>