Alberto beleza? você está certo precisa sim, porém a mesma já está na classe, eu utilizei todo o HTML fornecido na aula.
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org" >
<head>
<meta charset="UTF-8" />
<link type="text/css" rel="stylesheet" href="../../materialize/css/materialize.min.css" media="screen,projection" />
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet" />
<title>EscolAlura</title>
<script type="text/javascript" src="https://code.jquery.com/jquery-2.1.1.min.js"></script>
</head>
<body class="grey lighten-3">
<div id="formularioEdicao" class="container">
<h3 class="main-title center">Cadastrar Nota para <span th:text="${aluno.nome}"></span></h3>
<div class="row">
<form class="col s12" action="#" th:action="@{'/nota/salvar/' + ${aluno.id}}" th:object="${nota}" method="post">
<div class="section">
<h5>Notas</h5>
<div class="row">
<div class="input-field col s12">
<input id="valor" type="number" class="validate" th:value="${valor}" name="valor" />
<label for="valor">Nota</label>
</div>
</div>
</div>
<div class="row">
<div class="input-field col s12 center">
<button class="btn waves-effect waves-light" type="submit" name="action">Salvar Notas
</button>
</div>
</div>
</form>
</div>
</div> <!-- Fim do formulario de edicao -->
<script type="text/javascript" src="../../materialize/js/materialize.min.js"></script>
</body>
</html>