[docs] [issue12779] Update packaging documentation

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

(Replying to myself so that this report doesn’t show up in the “Issues without reply” section of the weekly email)

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nosy: +docs at python

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12779>
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