Add note to activate "Supported web addresses" in deep linking documentation (#12269)

This adds a note that users may need to enable a setting on their
Android device to test that their deep links are working.

cc: @chunhtai @hannah-hyj @KCO-SK
resolves #12153

---------

Co-authored-by: Shams Zakhour <[email protected]>

Author: johnpryan

src/content/cookbook/navigation/set-up-app-links.md

@@ -212,6 +212,11 @@ To test **both** web and app setup, you must click a link
 directly through web browser or another app.
 One way is to create a Google Doc, add the link, and tap on it.
 
+:::note
+If you are debugging locally (and not downloading the app from the Play Store),
+you might need to enable the toggle for **Supported web addresses** manually.
+:::
+
 If everything is set up correctly, the Flutter application
 launches and displays the details screen: