Fix .NET migration guide URL

Author: bjorn-jarisch

articles/event-hubs/event-hubs-event-processor-host.md

@@ -21,7 +21,7 @@ ms.author: shvija
 # Event processor host
 > [!NOTE]
 > This article applies to the old version of Azure Event Hubs SDK. To learn how to migrate your code to the newer version of the SDK, see these migration guides. 
-> - [.NET](https://github.com/Azure/azure-sdk-for-net/blob/master/sdk/eventhub/Azure.Messaging.EventHubs/MIGRATIONGUIDE.md)
+> - [.NET](https://github.com/Azure/azure-sdk-for-net/blob/master/sdk/eventhub/Azure.Messaging.EventHubs/MigrationGuide.md)
 > - [Java](https://github.com/Azure/azure-sdk-for-java/blob/master/sdk/eventhubs/azure-messaging-eventhubs/migration-guide.md)
 > - [Python](https://github.com/Azure/azure-sdk-for-python/blob/master/sdk/eventhub/azure-eventhub/migration_guide.md)
 > - [Java Script](https://github.com/Azure/azure-sdk-for-js/blob/master/sdk/eventhub/event-hubs/migrationguide.md)