Somebody made list.__dict__ grow a '__doc__' key, but apparently didn't

run the test suite afterwards.  Either that, or whether '__doc__' shows
up is platform-dependent!

Lib/test/test_descrtut.py

@@ -191,6 +191,7 @@ Instead, you can get the same information from the list type:
      '__delattr__',
      '__delitem__',
      '__delslice__',
+     '__doc__',
      '__eq__',
      '__ge__',
      '__getattribute__',