Fix topk metrics

[sergunya17]

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Type of Change

• Examples / docs / tutorials / contributors update
• Bug fix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves an existing feature)
• New feature (non-breaking change which adds functionality)
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• Have you updated tests for the new functionality?
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• Have you updated the CHANGELOG?
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[pep8speaks]

Hello @sergunya17! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2021-10-19 19:49:32 UTC

[Scitator]

could you please add docs on metric logic under self.batch/epoch metrics? For example, when you specify AccuracyCallback, it would add accuracy01 to the metrics storages

Pull request has been modified.

[Scitator]

🤔 we also need to add a new metric to catalyst/metrics/__init__.py