Document new limitation from #1794

[kylorhall-atlassian]

Documents #1794 on behalf of @oleg-chibikov

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• Updated the documentation in website/

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[kylorhall-atlassian]

https://deploy-preview-1799--compiled-css-in-js.netlify.app/docs/limitations#returning-static-values-from-a-dynamic-property LGTM