fix typo

template/src/utils/about.html

@@ -35,7 +35,7 @@
             <h2 class="text-center">开源</h2>
 
             <p>
-                <a href="#" target="_blank">代码</a> <a href="#" target="_blank">文档</a>
+                <a href="https://github.com/QingdaoU/OnlineJudge" target="_blank">代码</a>
             </p>
 
             <h2 class="text-center">开发人员</h2>