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

[Mariatta Wijaya]

Mariatta Wijaya added the comment:

Backported to 3.6 by Miss Islington.
Closing this issue.
Thanks.

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resolution:  -> fixed
stage: backport needed -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue30096>
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