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

Synchronous translation from the following commits(Latest in front):

[1]: commit 84dacdbd("mm: document and polish read-ahead code")

[2]: commit 2f52578f("mm/util: Add folio_mapping() and
     folio_file_mapping()")

[3]: commit 889a3747("mm/lru: Add folio LRU functions")

[4]: commit c24016ac("mm: Add folio reference count functions")

Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Reviewed-by: Yanteng <Si&lt;siyanteng@loongson.cn>
Reviewed-by: Wu XiangCheng <bobwxc@email.cn>
Link: https://lore.kernel.org/r/0bd7b03a5d38dd1599715343360bef4289b7c0fb.1655863769.git.zhoubinbin@loongson.cn


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