Update CHANGELOG.md

Author: adamwathan

CHANGELOG.md

@@ -72,7 +72,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Support unbalanced parentheses and braces in quotes in arbitrary values and variants ([#13608](https://github.com/tailwindlabs/tailwindcss/pull/13608))
 - Add fallbacks for `@property` rules for Firefox ([#13655](https://github.com/tailwindlabs/tailwindcss/pull/13655))
 
-## Changed
+### Changed
 
 - Use `rem` units for breakpoints by default instead of `px` ([#13469](https://github.com/tailwindlabs/tailwindcss/pull/13469))
 - Use natural sorting when sorting classes ([#13507](https://github.com/tailwindlabs/tailwindcss/pull/13507), [#13532](https://github.com/tailwindlabs/tailwindcss/pull/13532))