[docs] [issue30004] in regex-howto, improve example on grouping

[Cristian Barbarosie]

Cristian Barbarosie <cristian.barbarosie at gmail.com> added the comment:

I'm sorry, I have no experience at all with Git. Could you please do it for me ?
The bug appears in two places, see my first two messages.
Thank you

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue30004>
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