[PATCH] dm: fix design.rst document

[Bin Meng]

On Mon, Feb 10, 2020 at 2:57 AM Dario Binacchi <dariobin at libero.it> wrote:
>
> The patch fixes some errors.
>
> Signed-off-by: Dario Binacchi <dariobin at libero.it>
> ---
>
>  doc/driver-model/design.rst | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>

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