MB-100: fixed funny typo in CHANGES

Change-Id: I594fa112cc2b383c6d27d5eee90b4aff56386342
Reviewed-on: http://review.couchbase.org/26652
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>