CBLT-181:  fix displayed URL for documentation zipfile

Change-Id: I151a831fe430a51bc75809eb447d7a8a9093295b
Reviewed-on: http://review.couchbase.org/35252
Tested-by: Philip Labee <philip@couchbase.com>
Reviewed-by: Eric Limare <eric.limare@couchbase.com>