docs(x-ref links): Change links to use dgeni syntax

Closes #1440

modules/angular2/src/transform/common/asset_reader.dart

@@ -5,14 +5,14 @@ import 'dart:convert';
 
 import 'package:barback/barback.dart';
 
-/// A class that allows fetching code using [AssetId]s without all the
-/// additional baggage of a [Transform].
+/// A class that allows fetching code using {@link AssetId}s without all the
+/// additional baggage of a {@link Transform}.
 abstract class AssetReader {
   Future<String> readAsString(AssetId id, {Encoding encoding});
   Future<bool> hasInput(AssetId id);
 
-  /// Creates an [AssetReader] using the `transform`, which should be a
-  /// [Transform] or [AggregateTransform].
+  /// Creates an {@link AssetReader} using the `transform`, which should be a
+  /// {@link Transform} or {@link AggregateTransform}.
   factory AssetReader.fromTransform(dynamic transform) =>
       new _TransformAssetReader(transform);
 }