docs: fix header level in HTML sample

kenjis · kenjis · commit 55b610dfcbc8 · 2023-01-21T13:09:07.000+09:00
diff --git a/user_guide_src/source/outgoing/views/012.php b/user_guide_src/source/outgoing/views/012.php
@@ -5,7 +5,7 @@
 <body>
     <h1><?= esc($heading) ?></h1>
 
-    <h3>My Todo List</h3>
+    <h2>My Todo List</h2>
 
     <ul>
     <?php foreach ($todo_list as $item): ?>
