docs: update note with link to adbc-quickstarts (adbc-drivers#69)

This upstreams a change I made in
adbc-drivers/docs.adbc-drivers.org#57 to add a
quickstarts link under the Python example in the MySQL driver docs, as
already exists for some of the other driver docs.

Author: ianmcook

go/docs/mysql.md

@@ -46,7 +46,7 @@ conn = dbapi.connect(
 )
 ```
 
-Note: The example above is for Python using the [adbc-driver-manager](https://pypi.org/project/adbc-driver-manager) package but the process will be similar for other driver managers.
+Note: The example above is for Python using the [adbc-driver-manager](https://pypi.org/project/adbc-driver-manager) package but the process will be similar for other driver managers. See [adbc-quickstarts](https://github.com/columnar-tech/adbc-quickstarts).
 
 ### Connection String Format