Missing login information in arender installation tutorial

The tutorial Nuxeo Annotations with ARender page available here:

https://doc.nuxeo.com/nxdoc/nuxeo-arender-connector/

is missing a key step in the installation process. You must log in in docker repository before you can install arender using docker.

The full process is described here:

https://github.com/nuxeo/marketplace-arender-connector