add docs for commit --change
add docs for commit --change

Docker-DCO-1.1-Signed-off-by: Daniel, Dao Quang Minh <dqminh89@gmail.com> (github: dqminh)

Docker-DCO-1.1-Signed-off-by: Dan Walsh <dwalsh@redhat.com> (github: rhatdan)

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