[PATCH] dm: fix dm-inlinecrypt docs warnings

Add this file to the index and use a longer heading overline string
to eliminate warnings:

Documentation/admin-guide/device-mapper/dm-inlinecrypt.rst:1: WARNING: Title overline too short.
========
dm-inlinecrypt
========
Documentation/admin-guide/device-mapper/dm-inlinecrypt.rst: WARNING: document isn't included in any toctree [toc.not_included]

Fixes: b4a0774bd7fd ("dm: add documentation for dm-inlinecrypt target")
Signed-off-by: Randy Dunlap <[email protected]>
---
Cc: Linlin Zhang <[email protected]>
Cc: Alasdair Kergon <[email protected]>
Cc: Mike Snitzer <[email protected]>
Cc: Mikulas Patocka <[email protected]>
Cc: Benjamin Marzinski <[email protected]>
Cc: [email protected]
Cc: Jonathan Corbet <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: [email protected]

 Documentation/admin-guide/device-mapper/dm-inlinecrypt.rst |    4 ++--
 Documentation/admin-guide/device-mapper/index.rst          |    1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

--- linux-next-20260508.orig/Documentation/admin-guide/device-mapper/dm-inlinecrypt.rst
+++ linux-next-20260508/Documentation/admin-guide/device-mapper/dm-inlinecrypt.rst
@@ -1,6 +1,6 @@
-========
+==============
 dm-inlinecrypt
-========
+==============
 
 Device-Mapper's "inlinecrypt" target provides transparent encryption of block devices
 using the inline encryption hardware.
--- linux-next-20260508.orig/Documentation/admin-guide/device-mapper/index.rst
+++ linux-next-20260508/Documentation/admin-guide/device-mapper/index.rst
@@ -15,6 +15,7 @@ Device Mapper
     dm-flakey
     dm-ima
     dm-init
+    dm-inlinecrypt
     dm-integrity
     dm-io
     dm-log