docs: zh_CN: update Chinese translations

Two new commits were added to the original document:

commit ddba35031db2ea89facc91c745e5ad55ba2e0e7f
commit 20bc8c1e

translate them into Chinese.

Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Reviewed-by: Wu XiangCheng <bobwxc@email.cn>
Link: https://lore.kernel.org/r/20210524022308.1216098-1-siyanteng@loongson.cn


Signed-off-by: Jonathan Corbet <corbet@lwn.net>