docs(messaging): how to config iOS remote notifications in Expo (#8212)

Author: ceafive

docs/messaging/usage/index.md

@@ -48,6 +48,22 @@ Since Expo SDK51, Notifications entitlement is no longer always added to iOS pro
 }
 ```
 
+## iOS - Remote notification
+
+If you require `remote notification` on Expo, you can also add this to your Expo `app.json` or `app.config.js`
+
+```json
+{
+  "expo": {
+    "ios": {
+      "infoPlist": {
+        "UIBackgroundModes": ["remote-notification"]
+      }
+    }
+  }
+}
+```
+
 # What does it do
 
 React Native Firebase provides native integration of Firebase Cloud Messaging (FCM) for both Android & iOS. FCM is a cost