Adding Glossary

[AlannaBurke]

Description

Term list: glossary.rst JS is used to load the terms for the tooltips

Started with a limited list of terms and updated a handful of pages. Once we're happy with it i'll add more terms and update the rest of the files.

Checklist

• [ ] The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• [ ] Only one issue is addressed in this pull request
• [ ] Labels from the issue that this PR is fixing are added to this pull request
• [ ] No unnecessary issues are included into this pull request.

[pytorch-bot[bot]]

:link: Helpful Links

:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3700

• :page_facing_up: Preview Python docs built from this PR

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:x: 1 New Failure

As of commit 0f324825f58450f6fb159ee04963d1d1a2925a5f with merge base 10eefc3b761a5b5407862b2336493b7ab859640f ():

NEW FAILURE - The following job has failed:

• link check on PR / linkChecker (gh) Process completed with exit code 1.

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