[html5lib] triple slash comment style

pkg/third_party/html5lib/test/support.dart

-/** Support code for the tests in this directory. */
+/// Support code for the tests in this directory.
 library support;
 
 import 'dart:io';
 import 'dart:collection';
 import 'package:path/path.dart' as path;
 import 'package:html5lib/src/treebuilder.dart';
 import 'package:html5lib/dom.dart';
 import 'package:html5lib/dom_parsing.dart';
 
 typedef TreeBuilder TreeBuilderFactory(bool namespaceHTMLElements);
@@ skipping 53 matching lines @@
         data[key] = '${data[key]}$line\n';
       }
     }
 
     if (data.length > 0) {
       result.add(normaliseOutput(data));
     }
     return result;
   }
 
-  /**
-   * If the current heading is a test section heading return the heading,
-   * otherwise return null.
-   */
+  /// If the current heading is a test section heading return the heading,
+  /// otherwise return null.
   static String sectionHeading(String line) {
     return line.startsWith("#") ? line.substring(1).trim() : null;
   }
 
   static Map normaliseOutput(Map data) {
     // Remove trailing newlines
     data.forEach((key, value) {
       if (value.endsWith("\n")) {
         data[key] = value.substring(0, value.length - 1);
       }
     });
     return data;
   }
 }
 
-/**
- * Serialize the [document] into the html5 test data format.
- */
+/// Serialize the [document] into the html5 test data format.
 testSerializer(Document document) {
   return (new TestSerializer()..visit(document)).toString();
 }
 
-/** Serializes the DOM into test format. See [testSerializer]. */
+/// Serializes the DOM into test format. See [testSerializer].
 class TestSerializer extends TreeVisitor {
   final StringBuffer _str;
   int _indent = 0;
   String _spaces = '';
 
   TestSerializer() : _str = new StringBuffer();
 
   String toString() => _str.toString();
 
   int get indent => _indent;
@@ skipping 46 matching lines @@
           key = "${attr.prefix} ${attr.name}";
         }
         _newline();
         _str.write('$key="$v"');
       }
       indent -= 2;
     }
     visitChildren(node);
   }
 }