Update how-to-create-custom-event-trigger.md

Fixed typo

Author: richardswinbank

articles/data-factory/how-to-create-custom-event-trigger.md

@@ -74,7 +74,7 @@ Data Factory expects events to follow the [Event Grid event schema](../event-gri
 1. Select your custom topic from the Azure subscription dropdown or manually enter the event topic scope.
 
    > [!NOTE]
-   > To create or modify a custom event trigger in Data Factory, you need to use an Azure account with appropriate role-based access control (Azure RBAC). No additional permission is required. The Data Factory service principle does *not* require special permission to your Event Grid. For more information about access control, see the [Role-based access control](#role-based-access-control) section.
+   > To create or modify a custom event trigger in Data Factory, you need to use an Azure account with appropriate role-based access control (Azure RBAC). No additional permission is required. The Data Factory service principal does *not* require special permission to your Event Grid. For more information about access control, see the [Role-based access control](#role-based-access-control) section.
 
 1. The **Subject begins with** and **Subject ends with** properties allow you to filter for trigger events. Both properties are optional.