Update CHANGELOG.md

Author: Amanieu

CHANGELOG.md

@@ -9,11 +9,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [0.15.4](https://github.com/rust-lang/hashbrown/compare/v0.15.3...v0.15.4) - 2025-06-05
 
-### Other
+### Changed
 
-- Remove optional dependency on compiler-builtins
-- Merge pull request #623 from cppbear/add-tests
-- add test for HashMap::get_mut with non-existent key
+- Removed optional dependency on compiler-builtins. This only affects building as part of `std`.
 
 ## [0.15.3](https://github.com/rust-lang/hashbrown/compare/v0.15.2...v0.15.3) - 2025-04-29