add type for variables

quickstart/101-devtest-labs/variables.tf

@@ -1,34 +1,41 @@
 variable "resource_group_location" {
+  type        = string
   default     = "eastus"
   description = "Location for all resources."
 }
 
 variable "resource_group_name_prefix" {
+  type        = string
   default     = "rg"
   description = "Prefix of the resource group name that's combined with a random ID so name is unique in your Azure subscription."
 }
 
 variable "lab_name" {
+  type        = string
   description = "The name of the new lab instance to be created"
   default     = "ExampleLab"
 }
 
 variable "vm_name" {
+  type        = string
   description = "The name of the vm to be created."
   default     = "example-vm"
 }
 
 variable "vm_size" {
+  type        = string
   description = "The size of the vm to be created."
   default     = "Standard_D4_v3"
 }
 
 variable "user_name" {
+  type        = string
   description = "The username for the local account that will be created on the new vm."
   default     = "exampleuser"
 }
 
 variable "password" {
+  type        = string
   description = "The password for the local account that will be created on the new vm."
   sensitive   = true
   default     = null