doc: fix short underline on release-notes

Signed-off-by: Alfredo Deza <adeza@redhat.com>

diff --git a/doc/release-notes.rst b/doc/release-notes.rst
index 72ac0f7736736673d0c3cd3a85d1fd3eba3e3bba..a904ba58a0cd0b67e0bfed780aa04910a06b093d 100644 (file)
--- a/doc/release-notes.rst
+++ b/doc/release-notes.rst
@@ -703,7 +703,7 @@ Notable Changes
 
 
 v12.1.3 Luminous (RC)
-====================
+=====================
 
 This is the fourth release candidate for Luminous, the next long term stable
 release.