Fix serialization doc bug, update to use class literals in a few more places

pkg/serialization/lib/src/basic_rule.dart

 // Copyright (c) 2012, 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.
 
 part of serialization;
 
 // TODO(alanknight): Figure out how to reasonably separate out the things
 // that require reflection without making the API more awkward. Or if that is
 // in fact necessary. Maybe the tree-shaking will just remove it if unused.
 
@@ skipping 79 matching lines @@
    *
    * This method lets you designate a function to use to set the value of a
    * field. It also makes the contents of that field be treated as essential,
    * which currently only has meaning if the field is a list. This is done
    * because you might set a list field's special treatment function to add
    * each item individually and that will only work if those objects already
    * exist.
    *
    * For example, to serialize a Serialization, we need its rules to be
    * individually added rather than just setting the rules field.
-   *      ..addRuleFor(new Serialization()).setFieldWith('rules',
+   *      ..addRuleFor(Serialization).setFieldWith('rules',
    *          (InstanceMirror s, List rules) {
    *            rules.forEach((x) => s.reflectee.addRule(x));
    * Note that the function is passed the owning object as well as the field
    * value, but that it is passed as a mirror.
    */
   void setFieldWith(String fieldName, SetWithFunction setWith) {
     _fields.addAllByName([fieldName]);
     _NamedField field = _fields.named(_asSymbol(fieldName));
     Function setter = (setWith == null) ? field.defaultSetter : setWith;
     field.customSetter = setter;
@@ skipping 551 matching lines @@
   if (value is String) {
     try {
       return new Symbol(value);
     } on ArgumentError {
       return null;
     };
   } else {
     return null;
   }
 }