Edits per Code Review

quickstart/101-vm-cluster-linux/variables.tf

@@ -8,4 +8,17 @@ variable "resource_group_name_prefix" {
   type        = string
   description = "Prefix of the resource group name that's combined with a random ID so name is unique in your Azure subscription."
   default     = "rg"
-}
+}
+
+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
+}