[PATCH v2 24/24] counters: docs: add a missing include

[Mauro Carvalho Chehab]

Changeset 37a0dbf631f6 ("counters: Introduce counter_atomic* counters")

Is causing two new warnings:

	.../Documentation/core-api/counters.rst:8: WARNING: Undefined substitution referenced: "copy".
	.../Documentation/core-api/counters.rst:9: WARNING: Undefined substitution referenced: "copy".

Because it forgot to include isonum.txt, which defines |copy|
macro.

While here, also add it to core-api index file, in order to
solve this warning:

	.../Documentation/core-api/counters.rst: WARNING: document isn't included in any toctree

Fixes: 37a0dbf631f6 ("counters: Introduce counter_atomic* counters")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
---
 Documentation/core-api/counters.rst | 1 +
 Documentation/core-api/index.rst    | 1 +
 2 files changed, 2 insertions(+)

diff --git a/Documentation/core-api/counters.rst b/Documentation/core-api/counters.rst
index 642d907f4d3a..2821aebf3f45 100644
--- a/Documentation/core-api/counters.rst
+++ b/Documentation/core-api/counters.rst
@@ -1,4 +1,5 @@
 .. SPDX-License-Identifier: GPL-2.0
+.. include:: <isonum.txt>
 
 ======================
 Simple atomic counters
diff --git a/Documentation/core-api/index.rst b/Documentation/core-api/index.rst
index 69171b1799f2..cf9cd44c1191 100644
--- a/Documentation/core-api/index.rst
+++ b/Documentation/core-api/index.rst
@@ -43,6 +43,7 @@ Library functionality that is used throughout the kernel.
    this_cpu_ops
    timekeeping
    errseq
+   counters
 
 Concurrency primitives
 ======================
-- 
2.26.2