Explicitly state requirements in 3rd column of conformance table

[sideshowbarker]

For all elements that have implicit roles, this change makes the third column of the “Rules of ARIA attribute usage by HTML element” table explicitly state which role values are not recommended or should not be used — that is, the change makes that column explicitly state, for example, “No role other than presentation, which is NOT RECOMMENDED”, or “Any role, though figure is NOT RECOMMENDED, or “img is also allowed, but NOT RECOMMENDED”.

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504 Gateway Time-out

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[w3cbot]

sideshowbarker marked as non substantive for IPR from ash-nazg.

[scottaohara]

thanks @sideshowbarker

unfortunately, i was in the middle of working on fixing exactly this per the validator issue where this topic had come up.

But this is a good stop gap until I finish the updates I was doing.