[Editorial] - [bc4a75] ARIA required owned elements - Inapplicable Example 3 improvement (#2251)

* Update aria-required-owned-element-bc4a75.md

* Update _rules/aria-required-owned-element-bc4a75.md

Co-authored-by: Jean-Yves Moyen <jym@siteimprove.com>

---------

Co-authored-by: Jean-Yves Moyen <jym@siteimprove.com>

Author: giacomo-petri

_rules/aria-required-owned-element-bc4a75.md

@@ -250,7 +250,7 @@ This `ul` element does not have an [explicit semantic role][].
 This element with the `progressbar` role does not need [required owned elements][].
 
 ```html
-<div role="progressbar" aria-valuenow="20" aria-valuemin="0" aria-valuemax="100">20 %</div>
+<div role="progressbar" aria-valuenow="20" aria-valuemin="0" aria-valuemax="100" aria-label="Completion">20 %</div>
 ```
 
 #### Inapplicable Example 4