cfb8a110b4
Since 20848 has been merged and both `docker create` and `docker run` share the same `runconfig` parser, now both `docker run` and `docker create` allow to specify the `--rm` flag. However, docs for `docker create` has not been udpated yet. This fix updates docs for `docker create` so that `--rm` flag has been included. This fix is related to 20848 and 25577. Signed-off-by: Yong Tang <yong.tang.github@outlook.com>