Updated sample (#256)

quickstart/101-resource-group/providers.tf

@@ -1,10 +1,8 @@
 terraform {
-  required_version = ">=0.12"
-
   required_providers {
     azurerm = {
       source  = "hashicorp/azurerm"
-      version = "~>2.0"
+      version = "~>3.0"
     }
     random = {
       source  = "hashicorp/random"

quickstart/101-resource-group/variables.tf

@@ -1,9 +1,11 @@
 variable "resource_group_location" {
+  type        = string
   default     = "eastus"
   description = "Location of the resource group."
 }
 
 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."
 }