update dpub role allowances for li element

[scottaohara]

ARIA in HTML is removing the allowances for doc-biblioentry and doc-endnote on <li> elements.

These are not technically valid children of ul, ol or role=list elements per the ARIA spec. Due to this, these roles are being deprecated in DPUB ARIA 1.1. Authors should be using standard list elements, or role=list and role=listitem elements instead.

Edited issue description to provide more clarity / per the closure of the original PR.

[straker]

Moving conversation from the pr. In essence, we won't remove the roles from the allowed list since they are only deprecated and as far as we know don't cause problems with screen readers if present. Will need to figure out how we want to handle and announce to the user deprecations in the ARIA spec.

[scottaohara]

@straker I saw that #3280 was merged, but that this issue is still open. I think this can be closed per your comment in the PR, but wanted to verify before closing myself.

[straker]

Yep. I think this can be closed as well. Thanks for the reminder.

[danielweck]

This issue was partially fixed (a bug was mistakenly introduced), see new issue #3372