docs: Remove XBPS coroutine section

[JuniorSuperTux]

Remove the manually compiling with coroutine support section due to package being default compiled with coroutine support enabled

Documentation change checklist

• [x] My documentation changes follow the docs style guide and any code examples follow the coding style guide.
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• [x] I have not moved any existing pages or changed any existing URLs without strong justification as to why.
• [x] I have not generated content using AI or a desktop utility such as grammarly.

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