[PATCH v2] Documentation: bcachefs: Add explicit title for idle work design doc

[Bagas Sanjaya <bagasdotme@gmail.com>]

Commit 9e260e4590e044 ("docs: bcachefs: idle work scheduling design
doc") adds design doc for idle work scheduling, but misses explicit
title heading, causing its two section headings to be toctree entries
instead.

Add the title.

Fixes: 9e260e4590e0 ("docs: bcachefs: idle work scheduling design doc")
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
---
Changes since v1 [1]:

  * Keep original "design doc" title (Kent)

[1]: https://lore.kernel.org/linux-doc/20250820002218.11547-1-bagasdotme@gmail.com/

 Documentation/filesystems/bcachefs/future/idle_work.rst | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/filesystems/bcachefs/future/idle_work.rst b/Documentation/filesystems/bcachefs/future/idle_work.rst
index 59a332509dcd97..8519fdcaa5ff49 100644
--- a/Documentation/filesystems/bcachefs/future/idle_work.rst
+++ b/Documentation/filesystems/bcachefs/future/idle_work.rst
@@ -1,4 +1,5 @@
-Idle/background work classes design doc:
+Idle/background work classes design doc
+=======================================
 
 Right now, our behaviour at idle isn't ideal, it was designed for servers that
 would be under sustained load, to keep pending work at a "medium" level, to

base-commit: 37c52167b007d9d0bb8c5ed53dd6efc4969a1356
-- 
An old man doll... just what I always wanted! - Clara