docs/zh_CN: add process/researcher-guidelines Chinese translation

Finish the translation of researcher-guidelines and add it to the
index file.

Update to commit 27103ddd ("Documentation: update mailing list
addresses")

Reviewed-by: Alex Shi <alexs@kernel.org>
Signed-off-by: Dongliang Mu <dzm91@hust.edu.cn>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20240614032211.241899-1-dzm91@hust.edu.cn