docs/zh_CN: fix a typo in howto

Fix a typo in Chinese translation of howto.rst

Fixes: 40d93e49 ("docs/zh_CN: update howto.rst to latest version")
Signed-off-by: Wang Yong <yongw.kernel@gmail.com>
Reviewed-by: Yanteng Si <siyanteng@loongson.cn>
Link: https://lore.kernel.org/r/20221208083353.160152-1-yongw.kernel@gmail.com


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