better example for line range highlighting

demo.html

@@ -241,7 +241,7 @@
 
 				<section>
 					<h2>Pretty Code</h2>
-					<pre><code class="hljs" data-trim data-line-numbers="4,8-9">
+					<pre><code class="hljs" data-trim data-line-numbers="4,8-11">
 import React, { useState } from 'react';
 
 function Example() {