[docs] [issue15628] Add import ABC hierarchy to docs for importlib

[Andrew Svetlov]

Andrew Svetlov added the comment:

Brett, what do you think about?

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assignee:  -> docs at python
components: +Documentation
keywords: +easy
nosy: +brett.cannon, docs at python

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15628>
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