added documentation about forcing streaming terse bucket infos

Change-Id: Ib725b5146dc7ca44ef067b7d4a26cf2879fe8b73
Reviewed-on: http://review.couchbase.org/36996
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>