docs: corrected punctuation and refs

[Jaskowicz1]

This PR corrects some punctuation with the section with Mac in the README.md, it also corrects some references in INDEX.md.

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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[braindigitalis]

pff Oxford lol