docs/zh_CN: modify some words

commit message in English, we better not give the Chinese readers a wrong guidance.

Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Reviewed-by: Alex Shi <alexs@kernel.org>
Link: https://lore.kernel.org/r/c46432c5801edd44800e679dc34bce95c5e37f85.1632389476.git.siyanteng@loongson.cn


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