Update extensibility.md (#34702)

* Update extensibility.md

* Update aspnetcore/fundamentals/servers/yarp/extensibility.md

* Update aspnetcore/fundamentals/servers/yarp/extensibility.md

Author: Rick-Anderson

aspnetcore/fundamentals/servers/yarp/extensibility.md

@@ -4,20 +4,22 @@ title: Overview of extensibility
 description: Overview of extensibility
 author: samsp-msft
 ms.author: samsp
-ms.date: 2/10/2025
+ms.date: 2/12/2025
 ms.topic: article
 content_well_notification: AI-contribution
 ai-usage: ai-assisted
 ---
 
 # Overview of YARP extensibility
 
+There are 2 main styles of extensibility for YARP, depending on the routing behavior desired:
+
 * Middleware Pipeline
 * Http Forwarder
 
 ## Middleware pipeline
 
-YARP uses the concept of [Routes](config-files.md#routes), [Clusters](config-files.md#clusters) and Destinations. These can be supplied through [configuration files](config-files.md) or [directly through code](config-providers.md). Based on the routing rules, YARP picks a cluster and enumerates the possible destinations. It then uses the middleware pipeline to select the destination based on destination health, session affinity, load balancing etc.
+YARP uses the concept of [Routes](xref:fundamentals/servers/yarp/config-files#routes), [Clusters](xref:fundamentals/servers/yarp/config-files#clusters) and Destinations. These can be supplied through [configuration files](xref:fundamentals/servers/yarp/config-files) or [directly through code](xref:fundamentals/servers/yarp/config-providers). Based on the routing rules, YARP picks a cluster and enumerates the possible destinations. It then uses the middleware pipeline to select the destination based on destination health, session affinity, load balancing etc.
 
 ![Image](https://github.com/user-attachments/assets/ff17a04f-0c3c-46c7-8ec2-a1ed3dbc948c)