updated known limitations about nested groups.

* On-demand provisioning does not support nested groups that are not directly assigned to the application.

Author: MohamSaied

articles/active-directory/app-provisioning/provision-on-demand.md

@@ -173,6 +173,7 @@ There are currently a few known limitations to on-demand provisioning. Post your
 * Restoring a previously soft-deleted user in the target tenant with on-demand provisioning isn't supported. If you try to soft delete a user with on-demand provisioning and then restore the user, it can result in duplicate users.
 * On-demand provisioning of roles isn't supported.
 * On-demand provisioning supports disabling users that have been unassigned from the application. However, it doesn't support disabling or deleting users that have been disabled or deleted from Azure AD. Those users won't appear when you search for a user.
+* On-demand provisioning does not support nested groups that are not directly assigned to the application.
 
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