Documented changes to API to enable new `docker cp` behavior.
Added documentation on `docker cp` usage and behavior.
Docker-DCO-1.1-Signed-off-by: Josh Hawn <josh.hawn@docker.com> (github: jlhawn)
Adding in other areas per comments
Updating with comments; equalizing generating man page info
Updating with duglin's comments
Doug is right here again;fixing.
Signed-off-by: Mary Anthony <mary@docker.com>
Bill W