Fixing doc references to --env-file
Fixing doc references to --env-file

Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)

e11137/cli,Zebrilee/cli,ashfall/cli,dnephin/cli,ashfall/cli,docker/cli,docker/cli,e11137/cli,dnephin/cli,thaJeztah/cli,thaJeztah/cli,Zebrilee/cli,allencloud/cli,riyazdf/cli,redpanda/cli,riyazdf/cli,allencloud/cli,redpanda/cli,cpuguy83/cli,cpuguy83/cli