Chore: add links to PRs and labels to changelog

directly reference the following PRs in the changelog, and prepend each entry with the appropriate 'label'

related to w3c/html-aria#419

- w3c/html-aria#352
- w3c/html-aria#367 (and follow on [commit](w3c/html-aria@9cc2c0a))
- w3c/html-aria#360
- w3c/html-aria#353
- w3c/html-aria#372
- w3c/html-aria#402
- w3c/html-aria#404
- w3c/html-aria#403
- w3c/html-aria#396
- w3c/html-aria#391
- w3c/html-aria#369
- w3c/html-aria#381

Author: scottaohara

html-aria/index.html

@@ -4749,54 +4749,54 @@ Change log
       <h3>Substantive changes since the last published Recommendationh3>
       <ul>
         <li>
-          16-Apr-2022:
+          <a href="https://github.com/w3c/html-aria/pull/372">16-Apr-2022 - Correction:a>
           <a href="#att-checked">`aria-checked`a> is not to be used on elements that support the `checked` attribute.
         li>
         <li>
-          03-Apr-2022:
+          <a href="https://github.com/w3c/html-aria/pull/402">03-Apr-2022 - Addition:a>
           Identify <a href="dfn-naming-prohibited">Naming Prohibiteda> elements.
         li>
         <li>
-          06-Mar-2022:
+          <a href="https://github.com/w3c/html-aria/pull/404">06-Mar-2022 - Addition:a>
           Allow `none` and `presentation` roles on <a href="#el-nav">`nav` elementa>.
         li>
         <li>
-          03-Mar-2022:
+          <a href="https://github.com/w3c/html-aria/pull/403">03-Mar-2022 - Addition:a>
           Restrict role allowances for <a href="#el-div">`div` elementa> when it is a child of a `dl` element.
         li>
         <li>
-          12-Feb-2022:
-           Allow `combobox` role on <a href="#el-button">`button` elementa>. 
-           Allow `combobox` and `checkbox` roles on <a href="#el-input-button">`input type=button` elementa>. 
+          <a href="https://github.com/w3c/html-aria/pull/396">12-Feb-2022 - Addition & Correction:a>
+          Allow `combobox` role on <a href="#el-button">`button` elementa>. 
+          Allow `combobox` and `checkbox` roles on <a href="#el-input-button">`input type=button` elementa>. 
         li>
         <li>
-          18-Jan-2022:
+          <a href="https://github.com/w3c/html-aria/pull/391">18-Jan-2022 - Addition:a>
           Added <a href="#docconformance-deprecated">Requirements for deprecated ARIA role, state and property attributesa>.
         li>
         <li>
-          06-Jan-2022:
+          <a href="https://github.com/w3c/html-aria/pull/369">06-Jan-2022 - Addition:a>
           Change allowances for `doc-biblioentry` and `doc-endnote` roles on the <a href="#el-li">`li` elementa>. 
           These roles are deprecated in [[[dpub-aria-1.1]]].
         li>
         <li>
-          13-Dec-2021:
+          <a href="https://github.com/w3c/html-aria/pull/381">13-Dec-2021 - Correction:a>
           Allow `radio` role on <a href="#el-img">`img alt="some text"` elementa>.
         li>
         <li>
-          07-Dec-2021:
+          <a href="https://github.com/w3c/html-aria/pull/353">07-Dec-2021: - Correction:a> 
           Allow only `none` and `presentation` roles for <a href="#el-wbr">`wbr` elementa>. 
           Allow only `aria-hidden` global attribute for <a href="#el-br">`br`a> and <a href="#el-wbr">`wbr`a> elements.
         li>
         <li>
-          02-Dec-2021:
+          <a href="https://github.com/w3c/html-aria/pull/367">02-Dec-2021 - Addition:a> 
           Allow `group` role on <a href="#el-section">`section` elementa>.
         li>
         <li>
-          16-Nov-2021:
+          <a href="https://github.com/w3c/html-aria/pull/360">16-Nov-2021 - Addition:a>
           Allow `link` and `button` roles on <a href="#el-area-no-href">`area` without `href` elementa>.
         li>
         <li>
-          26-Oct-2021:
+          <a href="https://github.com/w3c/html-aria/pull/352">26-Oct-2021 - Addition:a>
           Allow `aria-hidden` attribute on the <a href="#el-picture">`picture` elementa>. 
         li>
       ul>