pkg/docgen: fixed some references within typedef doc comments

pkg/docgen/test/typedef_test.dart

 // Copyright (c) 2014, 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.
 
 library docgen.test.typedef;
 
 import 'dart:convert';
 import 'dart:io';
 
 import 'package:path/path.dart' as p;
@@ skipping 34 matching lines @@
       var classes = testLibBar['classes'] as Map<String, dynamic>;
 
       expect(classes, hasLength(3));
 
       expect(classes['class'], isList);
       expect(classes['error'], isList);
 
       var typeDefs = classes['typedef'] as Map<String, dynamic>;
       var comparator = typeDefs['AnATransformer'] as Map<String, dynamic>;
 
-      var expectedPreview = '<p>Processes a [C] instance for testing.</p>';
+      var expectedPreview =
+          '<p>Processes a <a>test_lib-bar.C</a> instance for testing.</p>';
 
       expect(comparator['preview'], expectedPreview);
 
       var expectedComment = expectedPreview + '\n'
-          '<p>To eliminate import warnings for [A] and to test typedefs.</p>';
+          '<p>To eliminate import warnings for <a>test_lib.A</a> and to test '
+          'typedefs.</p>';
 
       expect(comparator['comment'], expectedComment);
     });
   });
 }