Re-add classList ReSpec reference

Author: Rahim Abdi

source

@@ -8908,7 +8908,7 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
     than a simple string, and where the attribute is frequently manipulated with
     methods such as add, remove, toggle, etc.</p>
 
-    <p class="example">See <code data-x="dom-element-id">classList</code>.</p>
+    <p class="example">See <code data-x="dom-element-classlist">classList</code>.</p>
    </dd>
 
    <dt><code data-x=""><var>T</var>?</code></dt>