Update the whats next section

Author: Rishit-dagli

content/en/docs/concepts/overview/_index.md

@@ -94,4 +94,6 @@ Kubernetes:
 ## {{% heading "whatsnext" %}}
 
 *   Take a look at the [Kubernetes Components](/docs/concepts/overview/components/)
+*   Take a look at the [The Kubernetes API](/docs/concepts/overview/kubernetes-api/)
+*  Take a look at the [Cluster Architecture](/docs/concepts/architecture/)
 *   Ready to [Get Started](/docs/setup/)?