add note shortcodes

Author: makocchi-git

content/en/docs/tasks/access-kubernetes-api/configure-aggregation-layer.md

@@ -18,7 +18,9 @@ Configuring the [aggregation layer](/docs/concepts/api-extension/apiserver-aggre
 
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 **Note:** There are a few setup requirements for getting the aggregation layer working in your environment to support mutual TLS auth between the proxy and extension apiservers. Kubernetes and the kube-apiserver have multiple CAs, so make sure that the proxy is signed by the aggregation layer CA and not by something else, like the master CA.
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