[docs] [issue26805] Refer to types.SimpleNamespace in namedtuple documentation

[STINNER Victor]

STINNER Victor added the comment:

types.SimpleNamespace is also available on Python 3.5, you may also modify Python 3.5 doc.

----------

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26805>
_______________________________________