Merge pull request #1041 from ExpressionEngine/7.dev

small heading change

Author: TomJaeger

docs/installation/changelog.md

@@ -8,7 +8,7 @@
 -->
 # ExpressionEngine v7 Change Log
 
-# Version 7.5.15
+## Version 7.5.15
 (Release: August 20th, 2025)
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