docs(Virtualizer): update examples for better accessibility and add a11y docs section #33537
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Couple docs-only updates to virtualizer stories that add:
tabindex+aria-labelto examples to allow keyboard scrolling & avoid having all content get read out when the scroll area is focused (some but not all browsers, e.g. Edge and Firefox, already make scroll overflow regions tabbable by default).aria-liveto the scroll-to example's text for screen reader feedback on scrolltabindex& when it is or isn't neededI only added these to the scroll & dynamic scroll components since the base virtualizer doesn't have the
containernode built in, but I was kinda iffy on whether the base virtualizer should have it too.Related Issue(s)