docs: add fix for sphinx-llm build failures

[JordanMG13]

Per: canonical/sphinx-stack#622

• Have you updated CHANGELOG.md with relevant non-documentation file changes?
• Have you updated the documentation for this change?

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[a-velasco]

@JordanMG13 Thank you for this addition! Just a quick update - we're close to merging a big refactor/overhaul of the entire troubleshooting section (#27). When that's done, I'll add what you wrote into the new structure and update this PR.

[JordanMG13]

Sounds good, thanks!

[rkratky]

Lang. nits. Pre-approving.

[jahn-junior]

Thanks! One non-blocking suggestion.

[jahn-junior]

@JordanMG13 The CLA check is reporting that you haven't signed. Could you please review it?

http://www.ubuntu.com/legal/contributors/

That should be the last thing to address before I merge this. 👍

[JordanMG13]

Ahhh, I've done this through Launchpad but not Github...I'm assuming I have to do it twice then?

[JordanMG13]

I always just thought it was because I was using the Github site and it was using a noreply+github email address, as if I push a commit from my machine (using my SSH key and signed by my GPG key) this issue doesn't occur

EDIT: JordanMG13 (91559220+JordanMG13@users.noreply.github.com)