Update permissions prereqs

Author: ntrogh

articles/lab-services/how-to-configure-student-usage.md

@@ -29,10 +29,9 @@ Azure Lab Services supports up to 400 users per lab.
 
 ## Prerequisites
 
-- To manage users for the lab, your Azure account needs one of the following permissions:
-
-    - [Lab Creator](/azure/role-based-access-control/built-in-roles#lab-creator), [Lab Contributor](/azure/role-based-access-control/built-in-roles#lab-contributor), or [Lab Operator](/azure/role-based-access-control/built-in-roles#lab-operator) role at the lab plan or resource group level. Learn more about the [Azure Lab Services built-in roles](./administrator-guide.md#rbac-roles).
-    - [Owner](/azure/role-based-access-control/built-in-roles#owner) or [Contributor](/azure/role-based-access-control/built-in-roles#contributor) at the lab plan or resource group level.
+[!INCLUDE [Azure subscription](./includes/lab-services-prerequisite-subscription.md)]
+[!INCLUDE [Create and manage labs](./includes/lab-services-prerequisite-create-lab.md)]
+[!INCLUDE [Existing lab plan](./includes/lab-services-prerequisite-lab-plan.md)]
 
 ## Add users to a lab from an Azure AD group