docs/zh_CN: add core api genericirq translation

translate Documentation/core-api/genericirq.rst into Chinese.
Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Reviewed-by: Wu XiangCheng <bobwxc@email.cn>
Link: https://lore.kernel.org/r/20210709030143.548940-1-siyanteng@loongson.cnSigned-off-by: Jonathan Corbet <corbet@lwn.net>

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

@@ -80,13 +80,13 @@ Todolist:
    :maxdepth: 1
 
    cachetlb
+   genericirq
 
 Todolist:
 
 
    cpu_hotplug
    memory-hotplug
-   genericirq
    protection-keys