Fix a hgroup subheading example

This was missed in 6682bde.

source

@@ -17954,7 +17954,7 @@ interface <dfn interface>HTMLHeadingElement</dfn> : <span>HTMLElement</span> {
  &lt;footer>&lt;a href="../">Back to index...&lt;/a>&lt;/footer>
  &lt;hgroup>
   &lt;h1>Lorem ipsum&lt;/h1>
-  &lt;h2>The ipsum of all lorems&lt;/h2>
+  &lt;p>The ipsum of all lorems&lt;/p>
  &lt;/hgroup>
  &lt;p>A dolor sit amet, consectetur adipisicing elit, sed do eiusmod
  tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim
@@ -128634,6 +128634,7 @@ INSERT INTERFACES HERE
   Mark Schenk,
   Mark Vickers,
   Mark Wilton-Jones,
+  Markus Cadonau,
   Markus Stange,
   Martijn van der Ven,
   Martijn Wargers,