docs: fix minor typo in FCM guide (#1802)

site/docs-md/guides/push-notifications-firebase.md

@@ -101,7 +101,7 @@ ngOnInit() {
     // Register with Apple / Google to receive push via APNS/FCM
     PushNotifications.register();
 
-    // On succcess, we should be able to receive notifications
+    // On success, we should be able to receive notifications
     PushNotifications.addListener('registration', 
       (token: PushNotificationToken) => {
         alert('Push registration success, token: ' + token.value);
@@ -402,4 +402,4 @@ If you've setup your application correctly, you'll see an alert pop up on your h
 
 ![Push Test Android](/assets/img/docs/guides/firebase-push-notifications/push-test-android.png)
 
-![Push Test iOS](/assets/img/docs/guides/firebase-push-notifications/push-test-ios.png)
+![Push Test iOS](/assets/img/docs/guides/firebase-push-notifications/push-test-ios.png)