Change send deprecation link to hyperlinked text. (#5140)

Author: gsakakihara

firebase-messaging/src/main/java/com/google/firebase/messaging/FirebaseMessaging.java

@@ -487,9 +487,9 @@ public Task<Void> unsubscribeFromTopic(@NonNull String topic) {
    * <p>When there is an active connection the message will be sent immediately, otherwise the
    * message will be queued up to the time to live (TTL) set in the message.
    *
-   * @deprecated FCM upstream is deprecated and will be decommissioned in June 2024. More details
-   *     can be found in <a
-   *     href="https://firebase.google.com/support/faq#fcm-23-deprecation">https://firebase.google.com/support/faq#fcm-23-deprecation</a>
+   * @deprecated FCM upstream is deprecated and will be decommissioned in June 2024. Learn more in
+   *     the <a href="https://firebase.google.com/support/faq#fcm-23-deprecation">FAQ about FCM
+   *     features deprecated in June 2023</a>.
    */
   @Deprecated
   public void send(@NonNull RemoteMessage message) {