Fix formatted on build

This section on these two versions looked really ugly do to we're spacing I am assuming.

http://docs.docker.io/en/master/api/docker_remote_api_v1.4/#build-an-image-from-dockerfile-via-stdin
http://docs.docker.io/en/master/api/docker_remote_api_v1.6/#build-an-image-from-dockerfile-via-stdin

I believe all the others looked fine though.