Modernize the docs for args.

pkg/args/example/test_runner.dart

 // Copyright (c) 2012, 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.
 
-/**
- * This is an example of converting the args in test.dart to use this API.
- * It shows what it looks like to build an [ArgParser] and then, when the code
- * is run, demonstrates what the generated usage text looks like.
- */
+/// This is an example of converting the args in test.dart to use this API.
+/// It shows what it looks like to build an [ArgParser] and then, when the code
+/// is run, demonstrates what the generated usage text looks like.
 library example;
 
 import 'dart:io';
 
 import 'package:args/args.dart';
 
 main() {
   var parser = new ArgParser();
 
   parser.addOption('mode', abbr: 'm', defaultsTo: 'debug',
@@ skipping 90 matching lines @@
 For example if the normal command that will be executed
 is 'dart file.dart' and you specify special command
 'python -u valgrind.py @ suffix' the final command will be
 'python -u valgrind.py dart file.dart suffix'""");
 
   parser.addFlag('time',
       help: 'Print timing information after running tests',
       defaultsTo: false);
 
   parser.addOption('dart',    help: 'Path to dart executable');
-  // TODO(antonm): rename the option.
   parser.addOption('drt',     help: 'Path to content shell executable');
   parser.addOption('dartium', help: 'Path to Dartium Chrome executable');
 
   parser.addFlag('batch', abbr: 'b',
       help: 'Run browser tests in batch mode',
       defaultsTo: true);
 
   print(parser.getUsage());
 }