docs: update changelog with migration details link

Author: ghiscoding

CHANGELOG.md

@@ -7,7 +7,7 @@ See [Conventional Commits](https://conventionalcommits.org) for commit guideline
 ## [9.0.0](https://github.com/ghiscoding/slickgrid-universal/compare/v5.14.0...v9.0.0) (2025-05-10)
 
 > [!NOTE]
-> #### Follow the [Migration to 9.0](https://ghiscoding.gitbook.io/slickgrid-universal/migrations/migration-to-9.x) for all the changes and take a look at the [v9.0.0](https://github.com/ghiscoding/slickgrid-universal/releases/tag/v9.0.0) release for the announcement and quick info.
+> ### Please visit the [v9.0.0](https://github.com/ghiscoding/slickgrid-universal/releases/tag/v9.0.0) GitHub release for more details about the migration.
 
 ### ⚠ BREAKING CHANGES