Fixed irrelevant "Microsoft.DesktopVirtualization/hostpools/sessionhosts/usersessions/read" copy.

There was a typo present in the "Assign custom roles with the Azure portal" section of the article.
We can see the value "Microsoft.DesktopVirtualization/hostpools/sessionhosts/usersessions/read" being repeated twice, on the step 4 of the chapter.

Author: Alexandru-Razvan Olariu

articles/virtual-desktop/autoscale-scaling-plan.md

@@ -111,7 +111,6 @@ To create and assign the custom role to your subscription with the Azure portal:
 				 "Microsoft.DesktopVirtualization/hostpools/sessionhosts/usersessions/delete"
 				 "Microsoft.DesktopVirtualization/hostpools/sessionhosts/usersessions/read"
 				 "Microsoft.DesktopVirtualization/hostpools/sessionhosts/usersessions/sendMessage/action"
-				 "Microsoft.DesktopVirtualization/hostpools/sessionhosts/usersessions/read"
     ```
 
 5. When you're finished, select **Ok**.