Fixing some nits

Author: hiranya911

src/main/java/com/google/firebase/messaging/Message.java

@@ -30,7 +30,7 @@
  * Represents a message that can be sent via Firebase Cloud Messaging (FCM). Contains payload
  * information as well as the recipient information. In particular, the message must contain
  * exactly one of token, topic or condition parameters. Instances of this class are thread-safe
- * and immutable. Use {@link Message.Builder} to crete new instances.
+ * and immutable. Use {@link Message.Builder} to create new instances.
  *
  * @see
  * <a href="https://firebase.google.com/docs/reference/fcm/rest/v1/projects.messages">FCM message

src/test/java/com/google/firebase/messaging/FirebaseMessagingIT.java

@@ -41,7 +41,7 @@ public void testSend() throws Exception {
     Message message = Message.builder()
         .setNotification(new Notification("Title", "Body"))
         .setAndroidConfig(AndroidConfig.builder()
-            .setRestrictedPackageName("com.demoapps.hkj")
+            .setRestrictedPackageName("com.google.firebase.testing")
             .build())
         .setApnsConfig(ApnsConfig.builder()
             .setAps(Aps.builder()