update changelog

Author: RobinMalfait

CHANGELOG.md

@@ -30,6 +30,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fix missing `string[]` in the `theme.dropShadow` types ([#10072](https://github.com/tailwindlabs/tailwindcss/pull/10072))
 - Update list of length units ([#10100](https://github.com/tailwindlabs/tailwindcss/pull/10100))
 - Fix not matching arbitrary properties when closely followed by square brackets ([#10212](https://github.com/tailwindlabs/tailwindcss/pull/10212))
+- Allow direct nesting in `root` or `@layer` nodes ([#10229](https://github.com/tailwindlabs/tailwindcss/pull/10229))
 
 ### Changed