Update event-hub-assign-roles.md

Slight wording change to the example PowerShell command to add a role assignement. The placeholder was misleading that you needed a Storage Account ID when it should be clearer that you need the ResourceId from the previous Get-AzResource command.

Author: liam-stevenson

includes/passwordless/event-hub/event-hub-assign-roles.md

@@ -75,7 +75,7 @@ Copy the `Id` value from the preceding command output. You can then assign roles
 ```azurepowershell
 New-AzRoleAssignment -SignInName <user@domain> `
 -RoleDefinitionName "Azure Event Hubs Data Owner" `
--Scope <yourStorageAccountId>
+-Scope <yourResourceId>
 ```
 
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