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Summary:
This commit updates the `window.sideMenus.handleRightMenu`, so that
subsections are expanded on tutorials by default.

https://output.circle-artifacts.com/output/job/98508917-87df-4666-9958-c70683b3245d/artifacts/0/docs/tutorials/audio_io_tutorial.html

Tutorial subsections are important because they have anchors so
allow us to get the link to the specific figures / audio samples.

When responding issues/questions and when there is a corresponding
code snippet in tutorial, it is often easy to answer with links to
the tutorial.

However, by default the tutorial page collapses right side bar, and
I have to click the small "+" symbols to navigate to the subsection,
and the state of expansion does not persist across the page refresh.

This has been a pain point since we updated the Sphinx version to 3
in https://github.com/pytorch/audio/pull/1685.

Pull Request resolved: https://github.com/pytorch/audio/pull/2397

Reviewed By: xiaohui-zhang

Differential Revision: D36429745

Pulled By: mthrok

fbshipit-source-id: 97a5ae9270e68f8e88f0bca766d5a2c1839634e3