📝 Update release notes

[skip ci]

docs/en/docs/release-notes.md

@@ -34,6 +34,7 @@ hide:
 
 ### Internal
 
+* 🔧 Migrate docs from MkDocs to Zensical. PR [#15563](https://github.com/fastapi/fastapi/pull/15563) by [@tiangolo](https://github.com/tiangolo).
 * 🔒️ Only allow team members to modify dependencies. PR [#15548](https://github.com/fastapi/fastapi/pull/15548) by [@svlandeg](https://github.com/svlandeg).
 * ⬆ Bump actions/add-to-project from 1.0.2 to 2.0.0. PR [#15490](https://github.com/fastapi/fastapi/pull/15490) by [@dependabot[bot]](https://github.com/apps/dependabot).
 * ⬆ Bump actions/labeler from 6.0.1 to 6.1.0. PR [#15507](https://github.com/fastapi/fastapi/pull/15507) by [@dependabot[bot]](https://github.com/apps/dependabot).