update azurerm_kubernetes_cluster documentation

Author: vasyl-sw14

internal/services/containers/kubernetes_cluster_resource_test.go

@@ -915,7 +915,7 @@ resource "azurerm_kubernetes_cluster" "test" {
   dns_prefix          = "acctestaks%d"
   kubernetes_version  = %q
 
-  automatic_cluster_enabled        = %t
+  automatic_cluster_enabled = %t
 
   default_node_pool {
     name       = "default"

website/docs/r/kubernetes_cluster.html.markdown

@@ -97,6 +97,8 @@ In addition, one of either `identity` or `service_principal` blocks must be spec
 
 * `auto_scaler_profile` - (Optional) A `auto_scaler_profile` block as defined below.
 
+* `automatic_cluster_enabled` - (Optional) Specifies whether AKS Automatic cluster is enabled.
+
 * `azure_active_directory_role_based_access_control` - (Optional) A `azure_active_directory_role_based_access_control` block as defined below.
 
 * `azure_policy_enabled` - (Optional) Should the Azure Policy Add-On be enabled? For more details please visit [Understand Azure Policy for Azure Kubernetes Service](https://docs.microsoft.com/en-ie/azure/governance/policy/concepts/rego-for-aks)