[docs] use new named export for marked 4 in examples (#6893)

site/content/examples/05-bindings/04-textarea-inputs/App.svelte

@@ -1,5 +1,5 @@
 <script>
-	import marked from 'marked';
+	import { marked } from 'marked';
 	let text = `Some words are *italic*, some are **bold**`;
 </script>
 
@@ -9,4 +9,4 @@
 
 <style>
 	textarea { width: 100%; height: 200px; }
-</style>
+</style>

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

@@ -1,5 +1,5 @@
 <script>
-	import marked from 'marked';
+	import { marked } from 'marked';
 	let value = `Some words are *italic*, some are **bold**`;
 </script>
 

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

@@ -1,5 +1,5 @@
 <script>
-	import marked from 'marked';
+	import { marked } from 'marked';
 	let value = `Some words are *italic*, some are **bold**`;
 </script>