update prereqs with least privilege roles

Author: austinmccollum

articles/sentinel/quickstart-onboard.md

@@ -27,8 +27,8 @@ Microsoft Sentinel comes with many data connectors for Microsoft products such a
 
     - To enable Microsoft Sentinel, you need **contributor** permissions to the subscription in which the Microsoft Sentinel workspace resides.
 
-    - To use Microsoft Sentinel, you need either **contributor** or **reader** permissions on the resource group that the workspace belongs to.
-    - To install or manage solutions in the content hub, you need the **Template Spec Contributor** role on the resource group that the workspace belongs to.
+    - To use Microsoft Sentinel, you need either **Microsoft Sentinel Contributor** or **Microsoft Sentinel Reader** permissions on the resource group that the workspace belongs to.
+    - To install or manage solutions in the content hub, you need the **Microsoft Sentinel Contributor** role on the resource group that the workspace belongs to.
 
 - **Microsoft Sentinel is a paid service**. Review the [pricing options](https://go.microsoft.com/fwlink/?linkid=2104058) and the [Microsoft Sentinel pricing page](https://azure.microsoft.com/pricing/details/azure-sentinel/).