[docs] [issue26749] Update devguide to include Fedora's DNF

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0ed2497e5aa4 by Berker Peksag in branch 'default':
Issue #26749: Update devguide to include DNF package manager
https://hg.python.org/devguide/rev/0ed2497e5aa4

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nosy: +python-dev

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