Sphinx reports missing toctree entry warning:

Documentation/admin-guide/device-mapper/dm-pcache.rst: WARNING: document isn't 
included in any toctree [toc.not_included]

Add dm-pcache docs to device-mapper toctree to fix the warning.

Fixes: 6fb8fbbaf147 ("dm-pcache: add persistent cache target in device-mapper")
Reported-by: Stephen Rothwell <s...@canb.auug.org.au>
Closes: 
https://lore.kernel.org/linux-next/20250815131115.45518...@canb.auug.org.au/
Signed-off-by: Bagas Sanjaya <bagasdo...@gmail.com>
---
 Documentation/admin-guide/device-mapper/index.rst | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/admin-guide/device-mapper/index.rst 
b/Documentation/admin-guide/device-mapper/index.rst
index cc5aec8615765e..f1c1f4b824bafe 100644
--- a/Documentation/admin-guide/device-mapper/index.rst
+++ b/Documentation/admin-guide/device-mapper/index.rst
@@ -18,6 +18,7 @@ Device Mapper
     dm-integrity
     dm-io
     dm-log
+    dm-pcache
     dm-queue-length
     dm-raid
     dm-service-time
-- 
An old man doll... just what I always wanted! - Clara


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