docs/zh_CN: Add a new translation of reporting-regressions.rst

Last English version used:

commit d2b40ba2 ("docs: *-regressions.rst: explain how quickly
issues should be handled")

Signed-off-by: Wu XiangCheng <bobwxc@email.cn>
Reviewed-by: Yanteng <Si&lt;siyanteng@loongson.cn>
Link: https://lore.kernel.org/r/YsbuDGIpUjOzfAAh@bobwxc.mipc


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