MB-8801 some documantation a fixed typo

Change-Id: I094624a0dbe6165979fcf4a961d96e3605604493
Reviewed-on: http://review.couchbase.org/28460
Tested-by: Artem Stemkovski <artem@couchbase.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>