docs: Update the Xcode page.

[folospior]

Removed a misleading note, saying that the library needs to be built from source if using coroutines.

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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[CLAassistant]

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[folospior]

Right, sorry, I didn't have my email set in git and now it can't get the CLA signed. I will open a new pull request, this time with the email.

[Jaskowicz1]

No worries! Take your time :)