Fix Iterable.empty documentation.

sdk/lib/core/iterable.dart

 // Copyright (c) 2011, 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.core;
 
 /**
  * A collection of values, or "elements", that can be accessed sequentially.
  *
  * The elements of the iterable are accessed by getting an [Iterator]
@@ skipping 88 matching lines @@
   factory Iterable.generate(int count, [E generator(int index)]) {
     if (count <= 0) return new EmptyIterable<E>();
     return new _GeneratorIterable<E>(count, generator);
   }
 
   /**
    * Creates an empty iterable.
    *
    * The empty iterable has no elements, and iterating it always stops
    * immediately.
-   *
-   * An empty iterable can be used in places where you always that
-   * the iterable you would otherwise create is empty.
    */
   const factory Iterable.empty() = EmptyIterable<E>;
 
   /**
    * Returns a new `Iterator` that allows iterating the elements of this
    * `Iterable`.
    *
    * Iterable classes may specify the iteration order of their elements
    * (for example [List] always iterate in index order),
    * or they may leave it unspecified (for example a hash-based [Set]
@@ skipping 554 matching lines @@
  */
 abstract class BidirectionalIterator<E> implements Iterator<E> {
   /**
    * Move back to the previous element.
    *
    * Returns true and updates [current] if successful. Returns false
    * and sets [current] to null if there is no previous element.
    */
   bool movePrevious();
 }