Add storybook snapshot update command to testing documentation

[AetherUnbound]

Description

This came up in #3727 (comment).

This PR adds the storybook snapshot update command to the frontend testing documentation, so folks updating aspects of the frontend have all the necessary commands readily available in the same document.

I also removed all the preceding $ characters from these commands. Because they're of the console type (or perhaps just a code block in general), Sphinx makes it easy to copy the commands from the browser and paste into a shell. However, those commands come with the leading $ character too which makes them hard to paste and run immediately. This PR removes them all for this document, I'll have a follow up PR that removes them everywhere else.

Testing Instructions

View the generated documentation output and verify it looks correct.

Checklist

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• I ran the DAG documentation generator (if applicable).

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[github-actions]

Full-stack documentation: https://docs.openverse.org/_preview/3728

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Changed files 🔄:

• https://docs.openverse.org/_preview/3728/frontend/guides/test.html

[obulat]

Thank you for updating the documentation!

[AetherUnbound]

Okay, it looks like there's a difference in what's rendered when you remove the preceding $ 😕

Before

After

It copies easier, but it looks like all syntax is lost...going to try and see why that's the case. Otherwise I'll remove that commit from the PR.

[AetherUnbound]

Ah! It looks like it's not console we want, it's bash. I'll update that here and change that in the other PR I'm making 🙂

[dhruvkb]

LGTM! It'll be helpful to also have documentation on how to update the snapshots for a single test.

[dhruvkb]

This is present in many other files too, would you mind opening an issue to fix these? It'll be a simple change that hopefully gives a new contributor a reason to set things up locally!

[AetherUnbound]

I'm about to drop another PR that fixes these and adds a pre-commit check for it, actually!