[PATCH] docs: fix 'make htmldocs' warning in perf

[Wan Jiabing <wanjiabing@xxxxxxxx>]

Fix following 'make htmldocs' warnings:
./Documentation/admin-guide/perf/hisi-pcie-pmu.rst: WARNING:
document isn't included in any toctree

Fixes: c8602008e247 ("docs: perf: Add description for HiSilicon PCIe PMU driver")
Signed-off-by: Wan Jiabing <wanjiabing@xxxxxxxx>
---
 Documentation/admin-guide/perf/index.rst | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/admin-guide/perf/index.rst b/Documentation/admin-guide/perf/index.rst
index 5a8f2529a033..69b23f087c05 100644
--- a/Documentation/admin-guide/perf/index.rst
+++ b/Documentation/admin-guide/perf/index.rst
@@ -8,6 +8,7 @@ Performance monitor support
    :maxdepth: 1
 
    hisi-pmu
+   hisi-pcie-pmu
    imx-ddr
    qcom_l2_pmu
    qcom_l3_pmu
-- 
2.35.1