Proposals to resolve issues 506, 501, 490, 482, 437

I have proposed resolutions for the following:

   - https://github.com/w3c/wcag21/issues/506
   - https://github.com/w3c/wcag21/issues/501
   - https://github.com/w3c/wcag21/issues/490
   - https://github.com/w3c/wcag21/issues/482
   - https://github.com/w3c/wcag21/issues/437

I've provided pull requests for each, which I'm fine to amend as necessary.

Cheers,
David MacDonald



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