Updated aria-actions listbox demo

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I updated the aria-actions listbox demo based on previous feedback : Experimental Example of Scrollable Listbox with Actions on Options | APG | WAI | W3C<https://deploy-preview-448--aria-practices.netlify.app/aria/apg/patterns/listbox/examples/listbox-actions/>

Pull request: Revise Content for New Experimental Example of Scrollable Listbox with Actions on Options by mcking65 · Pull Request #3400 · w3c/aria-practices<https://github.com/w3c/aria-practices/pull/3400>

Curt

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