fix format

Author: weebao

docs/changes.md

@@ -12,7 +12,7 @@ Keep up with the latest updates here :D
 
 ## 2025-04-30
 
-## Fixed
+### Fixed
 
 - Spam-submitting the same solution will no longer deal damage to the bot ([#68](https://github.com/beatcode-official/server/pull/68))