Docs/zh_CN: Update the translation of sched-stats to 5.19-rc8

Docs/zh_CN: Update the translation of sched-stats to 5.19-rc8

Update to commit 223da1f1206e ("docs/scheduler:
fix unit error")

867c1cd5d05f ("docs/scheduler: Change unit of
cpu_time and rq_time to nanoseconds")

Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Reviewed-by: Wu XiangCheng <bobwxc@email.cn>
Reviewed-by: Alex Shi <alexs@kernel.org>
Link: https://lore.kernel.org/r/3cb1c4c466dfa38d72a867dc6e2c833ceb69ecb7.1658983157.git.siyanteng@loongson.cn
Signed-off-by: Jonathan Corbet <corbet@lwn.net>