Add warning about *.element.io

Author: bmarty

app/src/main/AndroidManifest.xml

@@ -84,6 +84,7 @@
                 <category android:name="android.intent.category.BROWSABLE" />
 
                 <data android:scheme="https" />
+                <!-- Note: we can't use "*.element.io" here because it'll intercept the "mas.element.io" domain too. -->
                 <!-- Matching asset file: https://app.element.io/.well-known/assetlinks.json -->
                 <data android:host="app.element.io" />
                 <!-- Matching asset file: https://develop.element.io/.well-known/assetlinks.json -->