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Summary:
This commit fixes the issue with the recent Sphinx-Gallery update.
Also it pins the versions of Sphinx-related packages.

Before:

<img width="256" alt="Screen Shot 2022-08-17 at 10 02 23 PM" src="https://user-images.githubusercontent.com/855818/185140952-28f2d98a-b586-424c-a003-b69089f48eb9.png">

After:

https://user-images.githubusercontent.com/855818/185271889-bd4f86a0-986b-43bb-8121-bd77750d74f0.mov

Pull Request resolved: https://github.com/pytorch/audio/pull/2629

Reviewed By: carolineechen

Differential Revision: D38816417

Pulled By: mthrok

fbshipit-source-id: 11ee3f9121d9a302772ee1f461dacae52eb28852