Fix doc

website/docs/r/iothub_file_upload.html.markdown

@@ -17,10 +17,56 @@ Manages a IotHub File Upload.
 ## Example Usage
 
 ```hcl
-resource "azurerm_iothub_file_upload" "example" {
-  connection_string = "TODO"
-  container_name = "example"
-  iothub_id = "TODO"
+resource "azurerm_resource_group" "test" {
+  name     = "example-resources"
+  location = "West Europe"
+}
+
+resource "azurerm_storage_account" "test" {
+  name                     = "examplestorage"
+  resource_group_name      = azurerm_resource_group.test.name
+  location                 = azurerm_resource_group.test.location
+  account_tier             = "Standard"
+  account_replication_type = "LRS"
+}
+
+resource "azurerm_storage_container" "test" {
+  name                  = "examplecontainer"
+  storage_account_name  = azurerm_storage_account.test.name
+  container_access_type = "private"
+}
+
+resource "azurerm_iothub" "test" {
+  name                = "example-iothub"
+  resource_group_name = azurerm_resource_group.test.name
+  location            = azurerm_resource_group.test.location
+
+  sku {
+    name     = "S1"
+    capacity = "1"
+  }
+
+  identity {
+    type = "SystemAssigned"
+  }
+}
+
+resource "azurerm_role_assignment" "test_storage_blob_data_contrib" {
+  role_definition_name = "Storage Blob Data Contributor"
+  scope                = azurerm_storage_account.test.id
+  principal_id         = azurerm_iothub.test.identity[0].principal_id
+}
+
+resource "azurerm_iothub_file_upload" "test" {
+  iothub_id         = azurerm_iothub.test.id
+  container_name    = azurerm_storage_container.test.name
+  connection_string = azurerm_storage_account.test.primary_blob_connection_string
+
+  authentication_type = "identityBased"
+
+  depends_on = [
+    azurerm_role_assignment.test_storage_blob_data_contrib,
+  ]
 }
 ```