correct h1 -> h2

DougInAMug · DougInAMug · commit 654ffd6ac1f3 · 2023-09-13T15:03:38.000+02:00
diff --git a/releases/index.rst b/releases/index.rst
@@ -63,6 +63,6 @@ releases from 0.23.0 to 0.30.1.
 
 
 Atom feed for releases
-======================
+----------------------
 
 https://github.com/borgbackup/borg/releases.atom
