[DOC] Clarify what attributes of azurerm_databricks_workspace are u…

…sed only with managed network (#26782)

The NAT Gateway and few other attributes could be specified only when an Azure Databricks
workspace is deployed with managed VNet, but current description doesn't explicitly state
that, leading to users thinking that NAT gateway settings could be specified also for
VNet-injected workspaces.

website/docs/r/databricks_workspace.html.markdown

@@ -42,7 +42,7 @@ The following arguments are supported:
 
 * `location` - (Required) Specifies the supported Azure location where the resource has to be created. Changing this forces a new resource to be created.
 
-* `load_balancer_backend_address_pool_id` - (Optional) Resource ID of the Outbound Load balancer Backend Address Pool for Secure Cluster Connectivity (No Public IP) workspace. Changing this forces a new resource to be created.
+* `load_balancer_backend_address_pool_id` - (Optional) Resource ID of the Outbound Load balancer Backend Address Pool for Secure Cluster Connectivity (No Public IP) workspace with managed virtual network. Changing this forces a new resource to be created.
 
 * `sku` - (Required) The `sku` to use for the Databricks Workspace. Possible values are `standard`, `premium`, or `trial`.
 
@@ -94,9 +94,9 @@ A `custom_parameters` block supports the following:
 
 * `machine_learning_workspace_id` - (Optional) The ID of a Azure Machine Learning workspace to link with Databricks workspace. Changing this forces a new resource to be created.
 
-* `nat_gateway_name` - (Optional) Name of the NAT gateway for Secure Cluster Connectivity (No Public IP) workspace subnets. Defaults to `nat-gateway`. Changing this forces a new resource to be created.
+* `nat_gateway_name` - (Optional) Name of the NAT gateway for Secure Cluster Connectivity (No Public IP) workspace subnets (only for workspace with managed virtual network). Defaults to `nat-gateway`. Changing this forces a new resource to be created.
 
-* `public_ip_name` - (Optional) Name of the Public IP for No Public IP workspace with managed vNet. Defaults to `nat-gw-public-ip`. Changing this forces a new resource to be created.
+* `public_ip_name` - (Optional) Name of the Public IP for No Public IP workspace with managed virtual network. Defaults to `nat-gw-public-ip`. Changing this forces a new resource to be created.
 
 * `no_public_ip` - (Optional) Are public IP Addresses not allowed? Possible values are `true` or `false`. Defaults to `false`.