docs/zh_CN: sync reporting-issues.rst

Sync zh translation reporting-issues.rst to
commit 58c53945 ("docs: reporting-issues: reduce quoting and assorted
fixes")

Drop reporting-bug.rst
Signed-off-by: Wu XiangCheng <bobwxc@email.cn>
Reviewed-by: Alex Shi <alexs@kernel.org>
Link: https://lore.kernel.org/r/20210413072934.GA2674@bobwxc.topSigned-off-by: Jonathan Corbet <corbet@lwn.net>