[PATCH -next v2] Docs: add percpu-counter-tree to core-api index

[Randy Dunlap]

Add percpu-counter-tree to the core-api index to prevent a docs warning:

Documentation/core-api/percpu-counter-tree.rst: WARNING: document isn't included in any toctree [toc.not_included]

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
---
v2: fix Cc:list

Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Cc: linux-doc@xxxxxxxxxxxxxxx

 Documentation/core-api/index.rst |    1 +
 1 file changed, 1 insertion(+)

--- linux-next-20260313.orig/Documentation/core-api/index.rst
+++ linux-next-20260313/Documentation/core-api/index.rst
@@ -57,6 +57,7 @@ Library functionality that is used throu
    min_heap
    parser
    list
+   percpu-counter-tree
 
 Low level entry and exit
 ========================