docs: fix sample code in tutorial text to match the exercise solution (sveltejs#463)

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`.

Author: gorisanson

content/tutorial/03-sveltekit/06-forms/01-the-form-element/README.md

@@ -8,7 +8,7 @@ Let's build a todo app. We've already got an in-memory database set up in `src/l
 
 ```svelte
 /// file: src/routes/+page.svelte
-<h1>Todos</h1>
+<h1>todos</h1>
 
 +++<form method="POST">
 	<label>
@@ -20,7 +20,7 @@ Let's build a todo app. We've already got an in-memory database set up in `src/l
 	</label>
 </form>+++
 
-{#each data.todos as todo}
+<ul class="todos">
 ```
 
 If we type something into the `<input>` and hit Enter, the browser makes a POST request (because of the `method="POST"` attribute) to the current page. But that results in an error, because we haven't created a server-side _action_ to handle the POST request. Let's do that now: