MB-100: removed : after internal settings descriptions

Change-Id: Ia5b984acf8f7d73885ea54ccddd9173d185571f6
Reviewed-on: http://review.couchbase.org/26530
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>