Fix the usage instructions for matcher and mock libraries.

pkg/unittest/lib/mock.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.
 
 /**
  * A simple mocking/spy library.
  *
  * ## Installing ##
  *
  * Use [pub][] to install this package. Add the following to your `pubspec.yaml`
  * file.
  *
  *     dependencies:
- *       mock: any
+ *       unittest: any
  *
  * Then run `pub install`.
  *
- * For more information, see the
- * [mock package on pub.dartlang.org](http://pub.dartlang.org/packages/mock).
+ * Import this into your Dart code with:
+ *
+ *     import 'package:unittest/mock.dart';
+ *
+ * For more information, see the [unittest package on pub.dartlang.org]
+ * (http://pub.dartlang.org/packages/unittest).
  *
  * ## Using ##
  *
  * To create a mock objects for some class T, create a new class using:
  *
  *     class MockT extends Mock implements T {};
  *
  * Then specify the [Behavior] of the Mock for different methods using
  * [when] (to select the method and parameters) and then the [Action]s
  * for the [Behavior] by calling [thenReturn], [alwaysReturn], [thenThrow],
@@ skipping 1510 matching lines @@
       }
     }
   }
 
   /** Clear both logs and behavior. */
   void reset() {
     resetBehavior();
     clearLogs();
   }
 }