📝 Update release notes

docs/en/docs/release-notes.md

@@ -19,6 +19,7 @@ hide:
 
 ### Internal
 
+* 🔧 Update MkDocs instant previews. PR [#11982](https://github.com/fastapi/fastapi/pull/11982) by [@tiangolo](https://github.com/tiangolo).
 * 🐛 Fix deploy docs previews script to handle mkdocs.yml files. PR [#11984](https://github.com/fastapi/fastapi/pull/11984) by [@tiangolo](https://github.com/tiangolo).
 * 💡 Add comment about custom Termynal line-height. PR [#11976](https://github.com/fastapi/fastapi/pull/11976) by [@tiangolo](https://github.com/tiangolo).
 * 👷 Add alls-green for test-redistribute. PR [#11974](https://github.com/fastapi/fastapi/pull/11974) by [@tiangolo](https://github.com/tiangolo).