[PATCH] fixup for "mm/demotion: Add documentation for memory tiering"

[Bagas Sanjaya]

Extend the title heading overline by one (=) to match the underline.

Fixes: 64fc925cf27dac ("mm/demotion: Add documentation for memory tiering")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Bagas Sanjaya <bagasdotme@xxxxxxxxx>
---
 Documentation/admin-guide/mm/memory-tiering.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/admin-guide/mm/memory-tiering.rst b/Documentation/admin-guide/mm/memory-tiering.rst
index 142c36651f5dd2..0a75e0dab1fd8e 100644
--- a/Documentation/admin-guide/mm/memory-tiering.rst
+++ b/Documentation/admin-guide/mm/memory-tiering.rst
@@ -2,7 +2,7 @@
 
 .. _admin_guide_memory_tiering:
 
-===========
+============
 Memory tiers
 ============
 
-- 
An old man doll... just what I always wanted! - Clara