[docs] [issue30096] Update examples in abc documentation to use abc.ABC

[Éric Araujo]

Éric Araujo added the comment:


New changeset 122e88a8354e3f75aeaf6211232dac88ac296d54 by Éric Araujo (Eric Appelt) in branch 'master':
bpo-30096: Use ABC in abc reference examples (#1220)
https://github.com/python/cpython/commit/122e88a8354e3f75aeaf6211232dac88ac296d54


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nosy: +merwok

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