docs: improved some sections for docs-style-standards

[Jaskowicz1]

This PR rewords some sections, now encouraging users to add images to their tutorials (to make it more user-friendly and to help us know they've tested their tutorial) and improving the wording for the testing section.

Documentation change checklist

• My documentation changes follow the docs style guide and any code 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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