docs(dynamic-links): warn users about enabling deep linking in their Flutter app (#10382)

* docs(dynamic-links): warn users about enabling deep linking in their Flutter app

* docs(dynamic-links): rm ##

* Update docs/dynamic-links/receive.md

Co-authored-by: Kevin Cheung <[email protected]>

---------

Co-authored-by: Kevin Cheung <[email protected]>

Author: russellwheatley

docs/dynamic-links/receive.md

@@ -133,6 +133,10 @@ for the app. You can find more details on how to retrieve your SHA-256 fingerpri
 
 To handle a Dynamic Link in your application, two scenarios require implementing.
 
+Warning: You may have unexpected results if you have enabled Flutter deep linking in your app.
+See [Migrating from plugin-based deep linking](https://docs.flutter.dev/development/ui/navigation/deep-linking#migrating-from-plugin-based-deep-linking).
+This [GitHub issue](https://github.com/firebase/flutterfire/issues/9469) illustrates what you ought to be aware of.
+
 ### Terminated State
 
 Set up the following methods: