Remove API documentation from path README.

pkg/path/test/posix_test.dart

Index: pkg/path/test/posix_test.dart
diff --git a/pkg/path/test/posix_test.dart b/pkg/path/test/posix_test.dart
index 3afb3bb88d67e3cd35d498df41519cb0bc7e8986..2801eadec2ff10c7f24158c56952f824f9f68b50 100644
--- a/pkg/path/test/posix_test.dart
+++ b/pkg/path/test/posix_test.dart
@@ -462,6 +462,8 @@ main() {
     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);
   });
@@ -473,5 +475,9 @@ main() {
     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_'));
   });
 }