Reinstate __all__ for pydoc

Author: AA-Turner

Lib/types.py

@@ -332,3 +332,5 @@ def wrapped(*args, **kwargs):
 EllipsisType = type(Ellipsis)
 NoneType = type(None)
 NotImplementedType = type(NotImplemented)
+
+__all__ = [n for n in globals() if not n.startswith('_')]  # for pydoc