Add missing parent <div> element to code example.

In the previous commit, the missing `{#each}` tags were restored, which is helpful -- but it left out the `<div>` that wraps the `<input>`s. If a reader were copying from the example into the workspace, they would notice the styles breaking as a result. This change is intended to clarify that the parent `<div>` element should remain intact.

site/content/tutorial/06-bindings/09-each-block-bindings/text.md

@@ -6,15 +6,17 @@ You can even bind to properties inside an `each` block.
 
 ```html
 {#each todos as todo}
-	<input
+	<div class:done={todo.done}>
-		type=checkbox
+		<input
-		bind:checked={todo.done}
+			type=checkbox
-	>
+			bind:checked={todo.done}
+		>
 
-	<input
+		<input
-		placeholder="What needs to be done?"
+			placeholder="What needs to be done?"
-		bind:value={todo.text}
+			bind:value={todo.text}
-	>
+		>
+	</div>
 {/each}
 ```