docs(m365): add instruction for setting environment in provider.tf

Author: jacdavi

m365/README.adoc

@@ -55,6 +55,7 @@ It is expected that this code is deployed by a user with administrator privledge
 ... Set `contact_emails` to administrators' emails and set `resource_group_name` to the resource group to create and deploy infrastructure in
 ... Review the defaults used for optional variables in <<terraform-variables>>. Some of these may need to be modified depending on your environment
 .. In `provider.tf`, replace `<YOUR_SUBSCRIPTION_UUID>` with the Subscription ID you'll be deploying in. The subscription ID can be found in the console, or as the `id` field output by the command `az account show`
+.. If you are deploying in GCC High, update `provider.tf` to replace the two instances of `environment = "public"` with `environment = "usgovernment"`
 .. (Optional, but recommended) Modify the `provider.tf` file to configure Terraform to store state in Azure. See external https://developer.hashicorp.com/terraform/language/backend/azurerm[documentation].
 . Run terraform
 .. In your `<myenv>` directory, Run `terraform init`. This only needs to be done once unless providers are updated

m365/terraform/env/example/provider.tf

@@ -17,8 +17,9 @@ terraform {
 provider "azurerm" {
   features {}
   subscription_id = "<YOUR_SUBSCRIPTION_UUID>"
+  environment = "public"
 }
 
 provider "azuread" {
-
+  environment = "public"
 }