docs(firebase_messaging): Fix broken link to Firebase TokenMessage documentation. (#8317)

Author: dreking

docs/messaging/usage.mdx

@@ -370,7 +370,7 @@ admin.messaging().send({
 ```
 
 This configuration provides the best chance that your data-only message will be delivered to the device. You can read full
-descriptions on the use of the properties on the [official Firebase documentation](https://firebase.google.com/docs/reference/admin/node/TokenMessage).
+descriptions on the use of the properties on the [official Firebase documentation](https://firebase.google.com/docs/reference/admin/node/firebase-admin.messaging.tokenmessage).
 
 Apple has very strict undisclosed polices on data only messages, which are very frequently ignored. For example, sending too many in a certain time period
 will cause the device to block messages, or if CPU consumption is high they will also be blocked.