The `--user`/`-u` of the `docker create` is the same as
`docker run`, which could take either `uid` or `uid:gid`
format. However, the description in the man page of `docker create`
is missing and may cause some confusions (comared with `docker run`).
This fix updates the man page of `docker create` so that it is
consistent with the man page of `docker run`.
This fix is related to 25304.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Upstream-commit: 3a778c9e1f
Component: cli
d2e0026ece