Fix changelog: Change breaking change to deprecation warning

- Changed 'Breaking Changes' section to 'Deprecations'
- Updated generated_assets_dirs from 'Removed' to 'Deprecated'
- Changed language from 'will raise an error' to 'will show a deprecation warning'
- Better reflects the actual implementation as a deprecation rather than removal

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: justin808

CHANGELOG.md

@@ -44,9 +44,9 @@ Changes since the last non-beta release.
 
 - **`react_on_rails:doctor` rake task**: New diagnostic command to validate React on Rails setup and identify configuration issues. Provides comprehensive checks for environment prerequisites, dependencies, Rails integration, and Webpack configuration. Use `rake react_on_rails:doctor` to diagnose your setup, with optional `VERBOSE=true` for detailed output. [PR 1791](https://github.com/shakacode/react_on_rails/pull/1791) by [AbanoubGhadban](https://github.com/AbanoubGhadban)
 
-#### Breaking Changes
+#### Deprecations
 
-- **Removed `generated_assets_dirs` configuration**: The legacy `config.generated_assets_dirs` option is no longer supported and will raise an error if used. Since Shakapacker is now required, asset paths are automatically determined from `shakapacker.yml` configuration. Remove any `config.generated_assets_dirs` from your `config/initializers/react_on_rails.rb` file. Use `public_output_path` in `config/shakapacker.yml` to customize asset output location instead. [PR 1798](https://github.com/shakacode/react_on_rails/pull/1798) by [justin808](https://github.com/justin808)
+- **Deprecated `generated_assets_dirs` configuration**: The legacy `config.generated_assets_dirs` option is now deprecated and will show a deprecation warning if used. Since Shakapacker is now required, asset paths are automatically determined from `shakapacker.yml` configuration. Remove any `config.generated_assets_dirs` from your `config/initializers/react_on_rails.rb` file. Use `public_output_path` in `config/shakapacker.yml` to customize asset output location instead. [PR 1798](https://github.com/shakacode/react_on_rails/pull/1798) by [justin808](https://github.com/justin808)
 
 #### API Improvements