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<siyanteng@loongson.cn>
Reviewed-by: Wu XiangCheng <bobwxc@email.cn>
Link: https://lore.kernel.org/r/0bd7b03a5d38dd1599715343360bef4289b7c0fb.1655863769.git.zhoubinbin@loongson.cnSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/translations/zh_CN/core-api/mm-api.rst

@@ -5,6 +5,7 @@
 :翻译:
 
  司延腾 Yanteng Si <siyanteng@loongson.cn>
+ 周彬彬 Binbin Zhou <zhoubinbin@loongson.cn>
 
 :校译:
 
@@ -66,12 +67,24 @@ mm/vmalloc.c
 
 该API在以下内核代码中:
 
-mm/readahead.c
+文件映射
+--------
 
 mm/filemap.c
 
+预读
+----
+
+mm/readahead.c
+
+回写
+----
+
 mm/page-writeback.c
 
+截断
+----
+
 mm/truncate.c
 
 include/linux/pagemap.h
@@ -105,6 +118,14 @@ mm/mempolicy.c
 
 include/linux/mm_types.h
 
+include/linux/mm_inline.h
+
+include/linux/page-flags.h
+
 include/linux/mm.h
 
+include/linux/page_ref.h
+
 include/linux/mmzone.h
+
+mm/util.c