Fix link to Firebase FCM API documentation

Updated the link to Firebase documentation for FCM API implementation.

Author: fahadsohail482

docs/messaging/usage/index.mdx

@@ -166,7 +166,7 @@ The device state and message contents determines which handler will be called:
   until the background message handler is registered via setBackgroundMessageHandler, signaling the application's javascript
   is loaded and ready to run.
 
-To learn more about how to send these options in your message payload, view the Firebase documentation for your [FCM API implementation](https://firebase.google.com/docs/cloud-messaging/concept-options).
+To learn more about how to send these options in your message payload, view the Firebase documentation for your [FCM API implementation](https://firebase.google.com/docs/cloud-messaging/customize-messages/set-message-type).
 
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