Fix some doc formatting problems, stop using "set" methods for NumberFormat

pkg/intl/lib/date_format.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 intl;
 
 // TODO(efortuna): Customized pattern system -- suggested by i18n needs
 // feedback on appropriateness.
 /**
  * DateFormat is for formatting and parsing dates in a locale-sensitive
@@ skipping 87 matching lines @@
  *      SECOND                       s
  *
  * Examples Using the US Locale:
  *
  *      Pattern                           Result
  *      ----------------                  -------
  *      new DateFormat.yMd()             -> 07/10/1996
  *      new DateFormat("yMd")            -> 07/10/1996
  *      new DateFormat.yMMMMd("en_US")   -> July 10, 1996
  *      new DateFormat("Hm", "en_US")    -> 12:08 PM
- *      new DateFormat.yMd().Hm()        -> 07/10/1996 12:08 PM
+ *      new DateFormat.yMd().add_Hm()        -> 07/10/1996 12:08 PM
  *
  * Explicit Pattern Syntax: Formats can also be specified with a pattern string.
  * The skeleton forms will resolve to explicit patterns of this form, but will
  * also adapt to different patterns in different locales.
  * The following characters are reserved:
  *
  *     Symbol   Meaning                Presentation        Example
  *     ------   -------                ------------        -------
  *     G        era designator         (Text)              AD
  *     y        year                   (Number)            1996
@@ skipping 462 matching lines @@
   _DateFormatField _match(String pattern) {
     for (var i = 0; i < _matchers.length; i++) {
       var regex = _matchers[i];
       var match = regex.firstMatch(pattern);
       if (match != null) {
         return _fieldConstructors[i](match.group(0), this);
       }
     }
   }
 }