📝 Update release notes

[skip ci]

Author: github-actions

docs/release-notes.md

@@ -8,6 +8,7 @@
 
 ### Docs
 
+* 📝 Update all docs references to `Optional` to use the new syntax in Python 3.10, e.g. `int | None`. PR [#1351](https://github.com/fastapi/sqlmodel/pull/1351) by [@tiangolo](https://github.com/tiangolo).
 * 📝 Update install and usage with FastAPI CLI in FastAPI tutorial. PR [#1350](https://github.com/fastapi/sqlmodel/pull/1350) by [@tiangolo](https://github.com/tiangolo).
 * 📝 Update FastAPI tutorial docs to use the new `model.sqlmodel_update()` instead of old `setattr()`. PR [#1117](https://github.com/fastapi/sqlmodel/pull/1117) by [@jpizquierdo](https://github.com/jpizquierdo).
 * ✏️ Update `docs/virtual-environments.md`. PR [#1321](https://github.com/fastapi/sqlmodel/pull/1321) by [@sylvainHellin](https://github.com/sylvainHellin).