Landing: Added extra doc to exampleSite

Author: lamATnginx

exampleSite/content/test-product/_index.md

@@ -4,10 +4,13 @@ title: Test pages
 weight: 100
 hasCustomContent: true
 ---
+<!-- <card-layout> - Available params: title (string)-->
 {{< card-layout >}}
+  <!-- <card-section> - Available params: title (string), showAsCards (boolean) -->
   <!-- If there is no "title" for <card-section>, it is implied it is the main content section and not a new content section -->
   {{< card-section >}}
     {{< card title="Call Out usages" >}}
+      <!-- <card> - Available params: title (string), titleUrl (string, relative path or absolute URL (e.g. https://google.com)), icon (string, relative path) -->
       Examples for call-out shortcode
     {{</ card >}}
     {{< card title="Code Block usages" >}}