[PATCH] doc: usage: modify mmc man-page

[Bin Meng]

On Mon, May 10, 2021 at 1:00 PM Jaehoon Chung <jh80.chung at samsung.com> wrote:
>
> Modify mmc man-page.
> - Change a descritpion about mmc erase command.

typo: description

> - Add whitespace to distinguish.
>
> Signed-off-by: Jaehoon Chung <jh80.chung at samsung.com>
> ---
>  doc/usage/mmc.rst | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>

Reviewed-by: Bin Meng <bmeng.cn at gmail.com>