remove unused and not functioning /docs api

Change-Id: I4bbafd2800fe64b5771bf8ec23ace3970688d619
Reviewed-on: http://review.couchbase.org/36734
Tested-by: Artem Stemkovski <artem@couchbase.com>
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>