fix: Add named provider configuration alias

Author: patrickmoore-nc

infrastructure/modules/lets-encrypt-certificates/README.md

@@ -28,7 +28,7 @@ A Terraform module to obtain publicly trusted SSL certificates from the Let's En
 
 ## Example Usage
 
-```terraform
+```hcl
 module "lets_encrypt_certificates" {
   source = "../../dtos-devops-templates/infrastructure/modules/lets-encrypt-certificates"
 
@@ -57,7 +57,7 @@ module "lets_encrypt_certificates" {
 
 Note the compound key `${naming_key}-${region}`:
 
-```terraform
+```hcl
 key_vault_certificates = {
   "nationalscreening_wildcard-uksouth" = {
     "id"                    = "redacted"

infrastructure/modules/linux-web-app/main.tf

@@ -75,7 +75,7 @@ resource "azurerm_linux_web_app" "this" {
 resource "azurerm_dns_txt_record" "validation" {
   for_each = toset(var.custom_domains)
 
-  provider = azurerm.hub # Terraform Managed Identity will need DNS Contributor RBAC role on the DNS Zone
+  provider = azurerm.dns # Terraform Managed Identity will need DNS Contributor RBAC role on the DNS Zone
 
   name                = "asuid.${split(".", each.key)[0]}"
   zone_name           = replace(each.key, "${split(".", each.key)[0]}.", "")

infrastructure/modules/linux-web-app/providers.tf

@@ -2,6 +2,7 @@ terraform {
   required_providers {
     azurerm = {
       source = "hashicorp/azurerm"
+      configuration_aliases = [azurerm.dns]
     }
   }
 }