CBQE-1324: remove unneeded comments

Change-Id: I829144b057b3148c934ef1e86f57097295e5edcd
Reviewed-on: http://review.couchbase.org/26708
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>