cmd: mmc: update the mmc command's usage about argument
authorJaehoon Chung <jh80.chung@samsung.com>
Tue, 15 Dec 2020 22:24:50 +0000 (07:24 +0900)
committerPeng Fan <peng.fan@nxp.com>
Fri, 19 Feb 2021 07:00:34 +0000 (15:00 +0800)
commit1019b19665ee719762f7613a36bf1b7ef9c3b578
tree9377601ebe7618ba60c15ff8bc7c9358d115eb5f
parent52ff04a216287e1e36d4a3ac977867412b91df45
cmd: mmc: update the mmc command's usage about argument

It's confusing whether arguments are optional or mandatory.
Update the command's usage to clarify how to use.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
cmd/mmc.c