docs(auth): add correct header

packages/wyatt_authentication_bloc/example/lib/presentation/features/welcome/welcome_page.dart

@@ -1,11 +1,18 @@
-// Author: Hugo Pointcheval
-// Email: git@pcl.ovh
-// -----
-// File: welcome_page.dart
-// Created Date: 19/08/2022 12:33:21
-// Last Modified: Wed Nov 09 2022
-// -----
-// Copyright (c) 2022
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
 
 import 'package:example_router/presentation/features/sign_in/sign_in_page.dart';
 import 'package:example_router/presentation/features/sign_up/sign_up_page.dart';