info is already a docker command, missed the rename in the examples
Renamed base image to master

Don't think that I should be introducing yet another naming, master
sounds exactly what I'm after (it will strengthen the git link).
Examples explanation, first and second arguments are not optional
Only root has access to these dirs

It makes sense for every user in the Docker group to be starting Docker
images from their own home. Happy to come back to this at a later date.