doc: add reference in docs to the async tutorial

also references tests and major PR dependencies

docs/advanced/index.md

@@ -5,6 +5,12 @@ The **Advanced User Guide** is gradually growing, you can already read about som
 At some point it will include:
 
 * How to use `async` and `await` with the async session.
+*   See: `docs_src\tutorial_async` for working examples as equivalents to `docs_src\tutorial`
+*   Also see `tests\tutorial_async` for fully functioning pytest tests against the examples
+*   
+*   These examples and tests are also passing `mypy` static checking if #PR58 addressing Issue#54 is included
+*   also note the TODO: for PR#435 subclassing the SQLAlchemey requirements fully into SQLModel
+*   
 * How to run migrations.
 * How to combine **SQLModel** models with SQLAlchemy.
 * ...and more. 🤓