Modify the HTML document below by replacing the two comments with an appropriate heading tag

<!DOCTYPE html>
<html>
<!-- Heading -->
<!-- Subheading -->
<body>

Some text

</body>
</html>

<!DOCTYPE html>
<html>
<h1>Heading</h1>
<h2>Subheading</h2>
<body>
Some text
</body>
</html>