[trivial] Update policy details to reflect updates to azurerm provider

[tdg5]

Updates example documentation to reflect appropriate arguments for more recent versions of the azurerm terraform provider.

Here's the checkov code which handles both syntaxes for checking sanity: https://github.com/bridgecrewio/checkov/blob/master/checkov/terraform/checks/resource/azure/AKSUsesAzurePoliciesAddon.py

Here's the existing doc if you care to reference: https://github.com/hlxsites/prisma-cloud-docs/blob/main/docs/en/enterprise-edition/policy-reference/azure-policies/azure-kubernetes-policies/ensure-that-aks-uses-azure-policies-add-on.adoc