update children page example

Author: LadyBluenotes

src/routes/reference/component-apis/children.mdx

@@ -62,12 +62,7 @@ The accessor also exposes `toArray()`.
 function Wrapper(props) {
 	const resolved = children(() => props.children);
 
-	return (
-		<div>
-			<header>{resolved()}</header>
-			<div>{resolved()}</div>
-		</div>
-	);
+	return <div>{resolved()}</div>;
 }
 
 function Example() {