docs: added a docs convention

[Jaskowicz1]

This PR adds a docs convention, as discussed for a while now. If you have anything you want adding to this page, please feel free to say! I want to make sure we're catching most, if not everything, for docs here.

Documentation change checklist

• My documentation changes follow the same style as the rest of the documentation and any examples follow the coding style guide.
• I tested that my change works before raising the PR (via running doxygen, and testing examples).
• I have not moved any existing pages or changed any existing URLs without strong justification as to why.
• I have not generated content using AI or a desktop utility such as grammarly.

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