Update comment

Author: aurimasc

com.unity.mobile.notifications/Runtime/Android/Plugins/com/unity/androidnotifications/UnityNotificationUtilities.java

@@ -287,7 +287,7 @@ private static Notification.Builder deserializeNotificationCustom(Context contex
                 extras = deserializeParcelable(in);
             }
 
-            // before v2 it was extras or variables, since 2 always both
+            // before v2 it was extras or variables, since 2 always variables
             if (extras == null) {
                 // extras serialized manually
                 id = in.readInt();