CBQE-0: fix usage typo

Change-Id: Ia02c684c5d78eddf15af1150739847b63e2b0922
Reviewed-on: http://review.couchbase.org/37449
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>