message: review fix: added pr ref to changelog
diff: PR [#2547](https://github.com/realm/realm-core/pull/2547/files)
  Fixes issue [#2538](https://github.com/realm/realm-core/issues/2538)
  * New file system utility functions: `util::remove_dir_recursive()` and
  - `util::File::for_each()`.
  + `util::File::for_each()`. PR [#2556](https://github.com/realm/realm-core/pull/2556).
  * Made case insensitive queries use the new index based case insensitive search.
  PR [#2486](https://github.com/realm/realm-core/pull/2486)
  