add another hr above content attributes

Author: keithamus

source

@@ -61753,6 +61753,8 @@ interface <dfn interface>HTMLDialogElement</dfn> : <span>HTMLElement</span> {
 &lt;/dialog></code></pre>
   </div>
 
+  <hr>
+
   <p>The <dfn element-attr for="dialog"><code data-x="attr-dialog-open">open</code></dfn> attribute
   is a <span>boolean attribute</span>. When specified, it indicates that the <code>dialog</code>
   element is active and that the user can interact with it.</p>