Improve usage details on overriding USER command in Docker run reference page
Improve usage details on overriding USER command in Docker run reference page

Signed-off-by: Sian Lerk Lau <89f5141a0c859add6f81ea60c338b0f9a421bf7b@gmail.com>

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