docs: <ContentDoc> slot example

Author: farnabaz

docs/content/4.api/1.components/1.content-doc.md

@@ -34,8 +34,10 @@ The `default`{lang=ts} slot can be used to render the content via `v-slot="{ dat
 <template>
   <main>
     <ContentDoc v-slot="{ doc }">
-      <h1>{{ doc.title }}</h1>
-      <ContentRenderer :value="doc" />
+      <article>
+        <h1>{{ doc.title }}</h1>
+        <ContentRenderer :value="doc" />
+      </article>
     </ContentDoc>
   </main>
 </template>