Tutorial instances don't match doc

[baslking]

The Nginx instance is not named as the tutorial documentation indicates, or maybe that's a Mac version thing? In any case the docker-stack.yml file uses this docker not one named Nginx

ID NAME MODE REPLICAS IMAGE PORTS
awuju96gnhho zenko-testing_lb replicated 1/1 zenko/loadbalancer:latest *:80->80/tcp
p3us1marp8hq zenko-testing_s3 replicated 1/1 scality/s3server:latest *:0->8000/tcp

[LaureVergeron]

Fixed, thanks :)