MB-9977: fix a typo

Change-Id: I440ac24013320b88fe613326a74c84d904c69f07
Reviewed-on: http://review.couchbase.org/36233
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>