pkg/unittest: fixed references to configuration implementations

pkg/unittest/lib/unittest.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
 /**
  * A library for writing dart unit tests.
  *
- * To import this library, use the pub package manager.
- * Create a pubspec.yaml file in your project and add
- * a dependency on unittest with the following lines:
- *     dependencies:
- *       unittest: any
- *
- * Then run 'pub install' from your project directory or using
- * the DartEditor.
- *
- * Please see [Pub Getting Started](http://pub.dartlang.org/doc)
- * for more details about the pub package manager.
+ * To import this library, install the 
+ * [unittest package](http://pub.dartlang.org/packages/unittest) via the pub 
+ * package manager. See the [Getting Started](http://pub.dartlang.org/doc)
+ * guide for more details.
  *
  * ##Concepts##
  *
- *  * Tests: Tests are specified via the top-level function [test], they can be
+ *  * __Tests__: Tests are specified via the top-level function [test], they can be
  *    organized together using [group].
- *  * Checks: Test expectations can be specified via [expect]
- *  * Matchers: [expect] assertions are written declaratively using [Matcher]s
- *  * Configuration: The framework can be adapted by calling [configure] with a
- *    [Configuration].  Common configurations can be found in this package
- *    under: 'dom\_config.dart' (deprecated), 'html\_config.dart' (for running
- *    tests compiled to Javascript in a browser), and 'vm\_config.dart' (for
- *    running native Dart tests on the VM).
+ *  * __Checks__: Test expectations can be specified via [expect]
+ *  * __Matchers__: [expect] assertions are written declaratively using the
+ *    [Matcher] class.
+ *  * __Configuration__: The framework can be adapted by calling [configure] with a
+ *    [Configuration]. See the other libraries in the `unittest` package for
+ *    alternative implementations of [Configuration] including
+ *    `compact_vm_config.dart`, `html_config.dart` and
+ *    `html_enhanced_config.dart`.
  *
  * ##Examples##
  *
  * A trivial test:
  *
  *     import 'package:unittest/unittest.dart';
  *     main() {
  *       test('this is a test', () {
  *         int x = 2 + 3;
  *         expect(x, equals(5));
@@ skipping 816 matching lines @@
 }
 
 /** Enable a test by ID. */
 void enableTest(int testId) => _setTestEnabledState(testId, true);
 
 /** Disable a test by ID. */
 void disableTest(int testId) => _setTestEnabledState(testId, false);
 
 /** Signature for a test function. */
 typedef dynamic TestFunction();