[polymer] switch comment style

pkg/polymer/lib/src/build/code_extractor.dart

 // 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.
 
-/** Transfomer that extracts inlined script code into separate assets. */
+/// Transfomer that extracts inlined script code into separate assets.
 library polymer.src.build.code_extractor;
 
 import 'dart:async';
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/parser.dart';
 import 'package:analyzer/src/generated/scanner.dart';
 import 'package:barback/barback.dart';
 import 'package:path/path.dart' as path;
 
 import 'common.dart';
 
-/**
- * Transformer that extracts Dart code inlined in HTML script tags and outputs a
- * separate file for each.
- */
+/// Transformer that extracts Dart code inlined in HTML script tags and outputs
+/// a separate file for each.
 class InlineCodeExtractor extends Transformer with PolymerTransformer {
   final TransformOptions options;
 
   InlineCodeExtractor(this.options);
 
-  /** Only run this transformer on .html files. */
+  /// Only run this transformer on .html files.
   final String allowedExtensions = ".html";
 
   Future apply(Transform transform) {
     var input = transform.primaryInput;
     var id = transform.primaryInput.id;
     return readPrimaryAsHtml(transform).then((document) {
       int count = 0;
       bool htmlChanged = false;
       for (var tag in document.querySelectorAll('script')) {
         // Only process tags that have inline Dart code
@@ skipping 23 matching lines @@
         transform.addOutput(new Asset.fromString(newId, code));
         textContent.remove();
         count++;
       }
       transform.addOutput(
           htmlChanged ? new Asset.fromString(id, document.outerHtml) : input);
     });
   }
 }
 
-/** Parse [code] and determine whether it has a library directive. */
+/// Parse [code] and determine whether it has a library directive.
 bool _hasLibraryDirective(String code) {
   var errorListener = new _ErrorCollector();
   var reader = new CharSequenceReader(code);
   var scanner = new Scanner(null, reader, errorListener);
   var token = scanner.tokenize();
   var unit = new Parser(null, errorListener).parseCompilationUnit(token);
   return unit.directives.any((d) => d is LibraryDirective);
 }
 
 class _ErrorCollector extends AnalysisErrorListener {
   final errors = <AnalysisError>[];
   onError(error) => errors.add(error);
 }