Fix sample code in tutorial text to match the exercise solution

[gorisanson]

This commit fix sample code in the-form-element tutorial text, which is 01-the-form-element /README.md, to match the exercise solution, which is 01-the-form-element/app-b/src/routes/+page.svelte.

In the-form-element tutorial page,
I found that the sample code in the text was not matched the exercise solution as we can see in the following:

Sample code in the text:

<h1>Todos</h1>

<form method="POST">
  <label>
    add a todo:
    <input
      name="description"
      autocomplete="off"
    />
  </label>
</form>

{#each data.todos as todo}

Exercise solution:

<h1>todos</h1>

<form method="POST">
  <label>
    add a todo:
    <input
      name="description"
      autocomplete="off"
    />
  </label>
</form>

<ul class="todos">
  {#each data.todos as todo (todo.id)}

This PR fix this mismatch.

[vercel]

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[dummdidumm]

Thank you!