Better docs for docker.endpoint option
Better docs for docker.endpoint option

Fixes https://github.com/hashicorp/nomad/issues/3533

dvusboy/nomad,burdandrei/nomad,nak3/nomad,dvusboy/nomad,hashicorp/nomad,burdandrei/nomad,Ashald/nomad,nak3/nomad,hashicorp/nomad,burdandrei/nomad,Ashald/nomad,dvusboy/nomad,hashicorp/nomad,nak3/nomad,hashicorp/nomad,Ashald/nomad,Ashald/nomad,dvusboy/nomad,dvusboy/nomad,Ashald/nomad,burdandrei/nomad,nak3/nomad,Ashald/nomad,hashicorp/nomad,burdandrei/nomad,nak3/nomad,burdandrei/nomad,dvusboy/nomad,dvusboy/nomad,Ashald/nomad,nak3/nomad,burdandrei/nomad,nak3/nomad,hashicorp/nomad