[issue26252] Add an example to importlib docs on setting up an importer

[Roundup Robot]

Roundup Robot added the comment:

New changeset dc24ab548e2b by Brett Cannon in branch 'default':
Issue #26252: Add an example on how to register a finder
https://hg.python.org/cpython/rev/dc24ab548e2b

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26252>
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