[analyzer] remove "auto-generated do not edit" comments

pkg/analyzer/test/generated/source_factory_test.dart

Index: pkg/analyzer/test/generated/source_factory_test.dart
diff --git a/pkg/analyzer/test/generated/source_factory_test.dart b/pkg/analyzer/test/generated/source_factory_test.dart
index 125943d178c8bd56a7e71c86ad01d8b67ce40e0e..e3ed1deeeba1599f670faf071c0e58c57491fcfc 100644
--- a/pkg/analyzer/test/generated/source_factory_test.dart
+++ b/pkg/analyzer/test/generated/source_factory_test.dart
@@ -2,9 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// This code was auto-generated, is not intended to be edited, and is subject to
-// significant change. Please see the README file for more information.
-
 library analyzer.test.generated.source_factory;
 
 import 'dart:convert';