[issue15029] doc: Update Defining New Types chapter according to PEP 253

[Irit Katriel]

Change by Irit Katriel <iritkatriel at yahoo.com>:


----------
title: Update Defining New Types chapter according to PEP 253 -> doc: Update Defining New Types chapter according to PEP 253
versions: +Python 3.10, Python 3.9 -Python 3.2

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue15029>
_______________________________________