Clarify: should aria-description be able to self-reference like aria-labelledby?

[MelSumner]

Pulled this comment out from #69 so we could discuss separately and clarify either way.

Do we intend the aria-description value on an element to be able to be included in its description by a self-reference in the value of aria-describedby?
If so, that does not appear to be supported by the current definition of aria-describedby computation.
If not, we may want to make that constraint more clear. It would make the behavior of aria-describedby slightly different from the behavior of aria-labelledby.

[jnurthen]

I think we resolved to add an editorial note to clarify that aria-describedby/description would not support this'
https://www.w3.org/2022/11/10-aria-minutes#t07

[DavidMacDonald]

I agree that we should probably not do this type of reference.
I think we want aria-description to be like aria-label ... except mapping to the ACCDESCRIPTION in the API