tweak some examples

site/content/tutorial/01-introduction/07-making-an-app/app-a/App.svelte

@@ -0,0 +1 @@
+<h1>What now?</h1>

site/content/tutorial/06-bindings/05-textarea-inputs/app-a/App.svelte

@@ -1,8 +1,6 @@
 <script>
 	import marked from 'marked';
-
 	let markdown = `Some words are *italic*, some are **bold**`;
-	$: rendered = marked(markdown);
 </script>
 
 <style>
@@ -11,4 +9,4 @@
 
 <textarea value={markdown}></textarea>
 
-{@html rendered}
+{@html marked(markdown)}

site/content/tutorial/06-bindings/05-textarea-inputs/app-b/App.svelte

@@ -1,8 +1,6 @@
 <script>
 	import marked from 'marked';
-
 	let markdown = `Some words are *italic*, some are **bold**`;
-	$: rendered = marked(markdown);
 </script>
 
 <style>
@@ -11,4 +9,4 @@
 
 <textarea bind:value={markdown}></textarea>
 
-{@html rendered}
+{@html marked(markdown)}