Addition: update figure role allowances (#415)

Addition: update figure role allowances

closes #412

As discussed in w3c/dpub-aria#42 (comment), `doc-example` is a dpub variant of the `figure` role.  This role being the same as `figure` but with the opportunity of being exposed as an "example" for its role description, needs to be an allowed role for the `figure` element.

index.html

@@ -63,6 +63,10 @@
  the following substantive additions and/or corrections have been proposed:
  </p>
  <ul>
+ <li>
+ <a href="https://github.com/w3c/html-aria/pull/415">13 February 2023 - Addition:</a>
+ update figure role allowances to include `doc-example`.
+ </li>
  <li>
  <a href="https://github.com/w3c/html-aria/pull/437">07 November 2022 - Correction:</a>
  Revisions to 'any role' term description.
@@ -1221,10 +1225,14 @@ <h2 id="docconformance">
  <br>
  <a><strong>Any `role`</strong></a>, though <code><a href="#index-aria-figure">figure</a></code> is NOT RECOMMENDED.
  </p>
- <p>
+ <p class="addition proposed">
  If the `figure` has a `figcaption` descendant:
  <br>
- <a><strong class="nosupport">No `role`</strong></a> other than <code><a href="#index-aria-figure">figure</a></code>, which is NOT RECOMMENDED.
+
+ DPub Role:
+ <a data-cite="dpub-aria-1.0#doc-example">`doc-example`</a>.</p>
+
+ <p>Otherwise, <code><a href="#index-aria-figure">figure</a></code> is allowed, but NOT RECOMMENDED.
  </p>
  <p>
  <a data-cite="wai-aria-1.2#global_states">Global `aria-*` attributes</a>