[Docs] Access and identity options for Azure Kubernetes Service (AKS)

Documentation for access and identity options in Azure Kubernetes Service (AKS) has been updated, including a preview feature for deploying an AKS cluster with OS Guard using ARM templates.

“Linked from "Quickstart: Deploy an Azure Linux with OS Guard for AKS (Preview) Cluster using an ARM Template": Access and identity options for Azure Kubernetes Service (AKS)”