Chore: change log and add missing class

* update changelog per merging #367
* add span with `proposed` and `addition` classes to the added `group` allowance.

index.html

@@ -2259,7 +2259,7 @@ <h2 id="docconformance">
                 <a href="#index-aria-dialog">`dialog`</a>,
                 <a href="#index-aria-document">`document`</a>,
                 <a href="#index-aria-feed">`feed`</a>,
-                <a href="#index-aria-group">`group`</a>,
+                <span class="addition proposed"><a href="#index-aria-group">`group`</a>,</span>
                 <a href="#index-aria-log">`log`</a>,
                 <a href="#index-aria-main">`main`</a>,
                 <a href="#index-aria-marquee">`marquee`</a>,
@@ -4199,9 +4199,13 @@ <h2>Change log</h2>
       <h3>Substantive changes since the last published Recommendation</h3>
 
       <ul>
+        <li>
+          02-Dec-2021:
+          Allow `group` role on <a href="#el-section">`section` element</a>.
+        </li>
         <li>
           16-Nov-2021:
-          Allow `link` and `button` roles on <a href="#el-area-no-href">`area` without `href`</a>.
+          Allow `link` and `button` roles on <a href="#el-area-no-href">`area` without `href` element</a>.
         </li>
         <li>
           26-Oct-2021: