use jsx comment

docs/content/foundations/accessibility/accessibility.mdx

@@ -67,7 +67,7 @@ In the following example, the `aria-labelledby` attribute references both the id
   Update your username, email, and password here.
 </Text>
 <div role="region" aria-labelledby="section-title section-description">
-  <!-- Form content goes here -->
+  {/* Form content goes here */}
 </div>
 ```