Fix changelog

Author: philipp-spiess

CHANGELOG.md

@@ -20,7 +20,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fix support for declaration fallbacks in plugins ([#14265](https://github.com/tailwindlabs/tailwindcss/pull/14265))
 - Support bare values when using `tailwindcss/defaultTheme` ([#14257](https://github.com/tailwindlabs/tailwindcss/pull/14257))
 
-## Changed
+### Changed
 
 - Remove named opacity support for color opacity modifiers ([#14278](https://github.com/tailwindlabs/tailwindcss/pull/14278))