Remove API documentation from path README.

pkg/path/test/posix_test.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.
 
 library path.test.posix_test;
 
 import 'package:unittest/unittest.dart';
 import 'package:path/path.dart' as path;
 
 main() {
@@ skipping 444 matching lines @@
 
   test('fromUri', () {
     expect(builder.fromUri(Uri.parse('file:///path/to/foo')), '/path/to/foo');
     expect(builder.fromUri(Uri.parse('file:///path/to/foo/')), '/path/to/foo/');
     expect(builder.fromUri(Uri.parse('file:///')), '/');
     expect(builder.fromUri(Uri.parse('foo/bar')), 'foo/bar');
     expect(builder.fromUri(Uri.parse('/path/to/foo')), '/path/to/foo');
     expect(builder.fromUri(Uri.parse('///path/to/foo')), '/path/to/foo');
     expect(builder.fromUri(Uri.parse('file:///path/to/foo%23bar')),
         '/path/to/foo#bar');
+    expect(builder.fromUri(Uri.parse('_%7B_%7D_%60_%5E_%20_%22_%25_')),
+        r'_{_}_`_^_ _"_%_');
     expect(() => builder.fromUri(Uri.parse('http://dartlang.org')),
         throwsArgumentError);
   });
 
   test('toUri', () {
     expect(builder.toUri('/path/to/foo'), Uri.parse('file:///path/to/foo'));
     expect(builder.toUri('/path/to/foo/'), Uri.parse('file:///path/to/foo/'));
     expect(builder.toUri('/'), Uri.parse('file:///'));
     expect(builder.toUri('foo/bar'), Uri.parse('foo/bar'));
     expect(builder.toUri('/path/to/foo#bar'),
         Uri.parse('file:///path/to/foo%23bar'));
+    expect(builder.toUri(r'/_{_}_`_^_ _"_%_'),
+        Uri.parse('file:///_%7B_%7D_%60_%5E_%20_%22_%25_'));
+    expect(builder.toUri(r'_{_}_`_^_ _"_%_'),
+        Uri.parse('_%7B_%7D_%60_%5E_%20_%22_%25_'));
   });
 }