[issue34839] doctest: Change example under warnings section

[Stéphane Wirtel]

Stéphane Wirtel <stephane at wirtel.be> added the comment:

Hi Raymond and Tim,

I just updated the PR with your recommendations.

Have a nice day,

----------

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34839>
_______________________________________