docs/zh_CN: Add sched-debug Chinese translation

Translate scheduler/sched-debug.rst into Chinese.

Signed-off-by: Tang Yizhou <tangyizhou@huawei.com>
Reviewed-by: Alex Shi <alexs@kernel.org>
Reviewed-by: Yanteng Si <siyanteng@loongson.cn>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>