Merge pull request #221132 from dominicbetts/central-migration-screenshots

IoT Central: update migration details

Author: PMEds28

articles/iot-central/core/howto-migrate-to-iot-hub.md

@@ -37,6 +37,10 @@ You need the following prerequisites to complete the device migration steps:
 
 The devices that you want to migrate must implement the **DeviceMove** command in a component called **migration**. The command payload contains the *ID scope* of the destination DPS instance. The migrator tool repository includes an example [DTDL component model](https://raw.githubusercontent.com/Azure/iotc-migrator/main/assets/deviceMigrationComponent.json) that that defines the **DeviceMove** command. You can add this component to your existing device templates.
 
+The tool assumes that the component name is `migration` and that the interface ID is `dtmi:azureiot:DeviceMigration;1`:
+
+:::image type="content" source="media/howto-migrate-to-iot-hub/component-name.png" alt-text="Screenshot that highlights the component name and interface ID.":::
+
 The tool repository also includes [sample code](https://github.com/Azure/iotc-migrator/tree/main/device_samples) that shows you how a device should implement the **DeviceMove** command.
 
 ## Tool setup
@@ -99,7 +103,7 @@ The migrator tool requires an Azure Active Directory application registration to
     ]
     ```
 
-    1. Save the changes.
+1. Save the changes.
 
 ### Add the device keys to DPS