docs/zh_CN: add core api cachetlb translation

Translate Documentation/core-api/cachetlb.rst into Chinese.
Reviewed-by: Wu XiangCheng <bobwxc@email.cn>
Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Reviewed-by: Alex Shi <alexs@kernel.org>
Link: https://lore.kernel.org/r/20210604090655.1971227-1-siyanteng@loongson.cnSigned-off-by: Jonathan Corbet <corbet@lwn.net>

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

@@ -76,9 +76,14 @@ Todolist:
 
 缓存管理，CPU热插拔管理等。
 
-Todolist:
+.. toctree::
+   :maxdepth: 1
 
    cachetlb
+
+Todolist:
+
+
    cpu_hotplug
    memory-hotplug
    genericirq