Remove outdated comment

Change-Id: Iaf0f5e32a70f206f4a8840631af45c0460a78129
Reviewed-on: http://review.couchbase.org/43905
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>