docs/zh_CN: Update the translation of kernel-api to 6.1-rc8

Update to commit d28a1de5 ("math64: favor kernel-doc
from header files").

Commit 03699f27 ("string: Rewrite and add more kern-doc
for the str*() functions").
Commit 31970608 ("overflow: Fix kern-doc markup for
functions")

Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Reviewed-by: Wu XiangCheng <bobwxc@email.cn>
Link: https://lore.kernel.org/r/46930487845717a6a718dbb6493864dee125ea1b.1670642548.git.siyanteng@loongson.cn


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