Fix typo in observe-list

pkg/observe/lib/src/observable_list.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 observe.src.observable_list;
 
 import 'dart:async';
 import 'dart:collection' show ListBase, UnmodifiableListView;
 import 'package:observe/observe.dart';
 import 'list_diff.dart' show projectListSplices, calcSplices;
@@ skipping 229 matching lines @@
     }
     _listRecords.add(record);
   }
 
   void _notifyChangeLength(int oldValue, int newValue) {
     notifyPropertyChange(#length, oldValue, newValue);
     notifyPropertyChange(#isEmpty, oldValue == 0, newValue == 0);
     notifyPropertyChange(#isNotEmpty, oldValue != 0, newValue != 0);
   }
 
-  void discardListChages() {
+  /// Deprecated. Name had a typo, use [discardListChanges] instead.
+  @deprecated
+  void discardListChages() => discardListChanges();
+
+  void discardListChanges() {
     // Leave _listRecords set so we don't schedule another delivery.
     if (_listRecords != null) _listRecords = [];
   }
 
   bool deliverListChanges() {
     if (_listRecords == null) return false;
     var records = projectListSplices(this, _listRecords);
     _listRecords = null;
 
     if (_hasListObservers && !records.isEmpty) {
@@ skipping 30 matching lines @@
 
     for (var change in changeRecords) {
       int addEnd = change.index + change.addedCount;
       int removeEnd = change.index + change.removed.length;
 
       var addedItems = current.getRange(change.index, addEnd);
       previous.replaceRange(change.index, removeEnd, addedItems);
     }
   }
 }