Update all tests

tests/corelib_strong/string_from_environment3_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // 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.
 
 main() {
-  const String.fromEnvironment('NOT_FOUND', defaultValue: 1);  /// 01: compile-time error
-  const String.fromEnvironment('NOT_FOUND', defaultValue: true);  /// 02: compile-time error
-  const String.fromEnvironment(null);  /// 03: compile-time error
-  const String.fromEnvironment(1);  /// 04: compile-time error
-  const String.fromEnvironment([]);  /// 05: compile-time error
+  const String.fromEnvironment('NOT_FOUND', defaultValue: 1);  //# 01: compile-time error
+  const String.fromEnvironment('NOT_FOUND', defaultValue: true);  //# 02: compile-time error
+  const String.fromEnvironment(null);  //# 03: compile-time error
+  const String.fromEnvironment(1);  //# 04: compile-time error
+  const String.fromEnvironment([]);  //# 05: compile-time error
 }