Update provision-resource-terraform.md added 'depends_on' so webapp waits for plan to be created

error occurs if plan not created when web app creates .. added depends_on

Author: annadeAz

articles/app-service/provision-resource-terraform.md

@@ -74,6 +74,7 @@ resource "azurerm_linux_web_app" "webapp" {
   location              = azurerm_resource_group.rg.location
   resource_group_name   = azurerm_resource_group.rg.name
   service_plan_id       = azurerm_service_plan.appserviceplan.id
+  depends_on            = [azurerm_service_plan.appserviceplan]
   https_only            = true
   site_config { 
     minimum_tls_version = "1.2"