Update Module docstring for Python 3

[JackKelly]

In Python 3, we can call super() without any arguments.

If I understand correctly, Python 2 is no longer supported by PyTorch, so we can change the documentation to be Python-3 only :)

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💊 CI failures summary and remediations

As of commit d68fc4a (more details on the Dr. CI page):

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✅ None of the CI failures appear to be your fault 💚

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• 1/1 broken upstream at merge base 50edc26 from Sep 27 until Sep 28

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1 job timed out:

• pytorch_linux_xenial_py3_clang7_asan_test2

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🚧 1 fixed upstream failure:

These were probably caused by upstream breakages that were already fixed.

Please rebase on the viable/strict branch (expand for instructions)

If your commit is older than viable/strict, run these commands:

git fetch https://github.com/pytorch/pytorch viable/strict
git rebase FETCH_HEAD

• pytorch_linux_xenial_py3_clang7_asan_test2 from Sep 27 until Sep 28 (7c62b6e - 145202c)
  • 🔁 rerun

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