How to update createADcontroller module?

Create an Azure VM with a new AD Forest (from a module)
https://github.com/Azure/azure-quickstart-templates/tree/master/active-directory-new-domain-module-use

Question: I am interested in learning how this works. What module is it? Am I able to update/modify it?

Thanks.

Start with the active-directory-new-domain-module-use template linked in the issue and trace which module creates the Azure VM and AD forest. Done would be a clear explanation of the module's identity and whether users can update or modify it.

Written by the indexing model from the issue text.