Fixed two doc comments in pathos.

pkg/pathos/lib/path.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.
 
 /// A comprehensive, cross-platform path manipulation library.
 library path;
 
 import 'dart:io' as io;
 
 /// An internal builder for the current OS so we can provide a straight
@@ skipping 227 matching lines @@
   String get separator => style.separator;
 
   /// Gets the part of [path] after the last separator on the builder's
   /// platform.
   ///
   ///     builder.basename('path/to/foo.dart'); // -> 'foo.dart'
   ///     builder.basename('path/to');          // -> 'to'
   ///
   /// Trailing separators are ignored.
   ///
-  ///     builder.dirname('path/to/'); // -> 'to'
+  ///     builder.basename('path/to/'); // -> 'to'
   String basename(String path) => _parse(path).basename;
 
   /// Gets the part of [path] after the last separator on the builder's
   /// platform, and without any trailing file extension.
   ///
   ///     builder.basenameWithoutExtension('path/to/foo.dart'); // -> 'foo'
   ///
   /// Trailing separators are ignored.
   ///
-  ///     builder.dirname('path/to/foo.dart/'); // -> 'foo'
+  ///     builder.basenameWithoutExtension('path/to/foo.dart/'); // -> 'foo'
   String basenameWithoutExtension(String path) =>
     _parse(path).basenameWithoutExtension;
 
   /// Gets the part of [path] before the last separator.
   ///
   ///     builder.dirname('path/to/foo.dart'); // -> 'path/to'
   ///     builder.dirname('path/to');          // -> 'path'
   ///
   /// Trailing separators are ignored.
   ///
@@ skipping 457 matching lines @@
     // doesn't count.
     if (lastDot <= 0) return [file, ''];
 
     return [file.substring(0, lastDot), file.substring(lastDot)];
   }
 
   _ParsedPath clone() => new _ParsedPath(
       style, root, new List.from(parts, growable: true),
                    new List.from(separators, growable: true));
 }