GitLab

Summary:
This commit updates the documentation configuration so that if an API (function or class) is used in tutorials, then it automatically add the links to the tutorials.

It also adds `py:func:` so that it's easy to jump from tutorials to API reference.

Note: the use of `py:func:` is not required to be recognized by Shpinx-gallery.

* https://482162-90321822-gh.circle-artifacts.com/0/docs/transforms.html#feature-extractions

<img width="776" alt="Screen Shot 2021-12-24 at 12 41 43 PM" src="https://user-images.githubusercontent.com/855818/147367407-cd86f114-7177-426a-b5ee-a25af17ae476.png">

* https://482162-90321822-gh.circle-artifacts.com/0/docs/transforms.html#mvdr

<img width="769" alt="Screen Shot 2021-12-24 at 12 42 31 PM" src="https://user-images.githubusercontent.com/855818/147367422-01fd245f-2f25-4875-a206-910e17ae0161.png">

Pull Request resolved: https://github.com/pytorch/audio/pull/2101

Reviewed By: hwangjeff

Differential Revision: D33311283

Pulled By: mthrok

fbshipit-source-id: e0c124d2a761e0f8d81c3d14c4ffc836ffffe288

Summary:
Pull Request resolved: https://github.com/pytorch/audio/pull/2096

run: `arc lint --apply-patches --paths-cmd 'hg files -I "./**/*.py"'`

Reviewed By: mthrok

Differential Revision: D33297351

fbshipit-source-id: 7bf5956edf0717c5ca90219f72414ff4eeaf5aa8