[polymer] switch comment style

pkg/polymer/lib/src/build/utils.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.
 
 library polymer.src.utils;
 
-/**
- * Converts a string name with hyphens into an identifier, by removing hyphens
- * and capitalizing the following letter. Optionally [startUppercase] to
- * captialize the first letter.
- */
+/// Converts a string name with hyphens into an identifier, by removing hyphens
+/// and capitalizing the following letter. Optionally [startUppercase] to
+/// captialize the first letter.
 String toCamelCase(String hyphenedName, {bool startUppercase: false}) {
   var segments = hyphenedName.split('-');
   int start = startUppercase ? 0 : 1;
   for (int i = start; i < segments.length; i++) {
     var segment = segments[i];
     if (segment.length > 0) {
       // Character between 'a'..'z' mapped to 'A'..'Z'
       segments[i] = '${segment[0].toUpperCase()}${segment.substring(1)}';
     }
   }
   return segments.join('');
 }
 
-/** Reverse of [toCamelCase]. */
+/// Reverse of [toCamelCase].
 String toHyphenedName(String word) {
   var sb = new StringBuffer();
   for (int i = 0; i < word.length; i++) {
     var lower = word[i].toLowerCase();
     if (word[i] != lower && i > 0) sb.write('-');
     sb.write(lower);
   }
   return sb.toString();
 }