docs/zh_CN: core-api: Update the translation of xarray.rst to 5.19-rc3

Synchronous translation from upstream commit ac23d1a96460
("XArray: Document the locking requirement for the xa_state")

Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Reviewed-by: Wu XiangCheng <bobwxc@email.cn>
Reviewed-by: Yanteng Si<siyanteng@loongson.cn>
Link: https://lore.kernel.org/r/b7d5f3ca914667ec14ba35a7c0db3ec3506e670d.1655863769.git.zhoubinbin@loongson.cn
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

docs/zh_CN: add core-api xarray translation

Translate Documentation/core-api/xarray.rst into Chinese

Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Reviewed-by: Alex Shi <alexs@kernel.org>
Link: https://lore.kernel.org/r/2a125bcb3220e7c1b72ae87bcad1b225dd950338.1634358018.git.siyanteng@loongson.cn
Signed-off-by: Jonathan Corbet <corbet@lwn.net>