fix all instances of "the the"

sdk/lib/io/directory.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 dart.io;
 
 /**
  * A reference to a directory (or _folder_) on the file system.
  *
  * A Directory instance is an object holding a [path] on which operations can
@@ skipping 142 matching lines @@
   /**
    * Sets the current working directory of the Dart process including
    * all running isolates. The new value set can be either a [Directory]
    * or a [String].
    *
    * The new value is passed to the OS's system call unchanged, so a
    * relative path passed as the new working directory will be
    * resolved by the OS.
    *
    * Note that setting the current working directory is a synchronous
-   * operation and that it changes the the working directory of *all*
+   * operation and that it changes the working directory of *all*
    * isolates.
    *
    * Use this with care - especially when working with asynchronous
    * operations and multiple isolates. Changing the working directory,
    * while asynchronous operations are pending or when other isolates
    * are working with the file system, can lead to unexpected results.
    */
   static void set current(path) {
     _Directory.current = path;
   }
@@ skipping 130 matching lines @@
    * directories, files, and links.
    */
   List<FileSystemEntity> listSync({bool recursive: false,
                                    bool followLinks: true});
 
   /**
    * Returns a human readable string for this Directory instance.
    */
   String toString();
 }