Fix documentation for identity collections.

sdk/lib/collection/hash_set.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.
 
 part of dart.collection;
 
 /** Common parts of [HashSet] and [LinkedHashSet] implementations. */
 abstract class _HashSetBase<E> extends SetBase<E> {
 
   // The following two methods override the ones in SetBase.
@@ skipping 83 matching lines @@
   external factory HashSet({bool equals(E e1, E e2),
                             int hashCode(E e),
                             bool isValidKey(potentialKey)});
 
   /**
    * Creates an unordered identity-based set.
    *
    * Effectively a shorthand for:
    *
    *     new HashSet<E>(equals: identical,
-   *                    hashCode: identityHashCodeOf)
+   *                    hashCode: identityHashCode)
    */
   external factory HashSet.identity();
 
   /**
    * Create a hash set containing all [elements].
    *
    * Creates a hash set as by `new HashSet<E>()` and adds each element of
    * `elements` to this set in the order they are iterated.
    *
    * All the [elements] should be assignable to [E].
@@ skipping 11 matching lines @@
   }
 
   /**
    * Provides an iterator that iterates over the elements of this set.
    *
    * The order of iteration is unspecified,
    * but consistent between changes to the set.
    */
   Iterator<E> get iterator;
 }