fix doc comments in dart:io and collection types

sdk/lib/collection/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.
 
 part of dart.collection;
 
 /**
  * Abstract implementation of a list.
  *
  * `ListBase` can be used as a base class for implementing the `List` interface.
@@ skipping 416 matching lines @@
       startIndex = 0;
     }
     for (int i = startIndex; i < this.length; i++) {
       if (this[i] == element) {
         return i;
       }
     }
     return -1;
   }
 
-  /**
-   * Returns the last index in the list [a] of the given [element], starting
-   * the search at index [startIndex] to 0.
-   * Returns -1 if [element] is not found.
-   */
   int lastIndexOf(Object element, [int startIndex]) {
     if (startIndex == null) {
       startIndex = this.length - 1;
     } else {
       if (startIndex < 0) {
         return -1;
       }
       if (startIndex >= this.length) {
         startIndex = this.length - 1;
       }
@@ skipping 55 matching lines @@
       for (E element in iterable) {
         this[index++] = element;
       }
     }
   }
 
   Iterable<E> get reversed => new ReversedListIterable<E>(this);
 
   String toString() => IterableBase.iterableToFullString(this, '[', ']');
 }