Update cdn-caching-policy.md

Author: Emma-yxf

articles/cdn/cdn-caching-policy.md

@@ -34,7 +34,7 @@ Azure Media Services provides [integrated CDN](https://azure.microsoft.com/updat
 
 You can use Azure portal or Azure Media Services APIs to configure cache header values.
 
-1. To configure cache headers using Azure portal, refer to [How to Manage Streaming Endpoints](https://learn.microsoft.com/en-us/azure/media-services/latest/stream-streaming-endpoint-concept) section Configuring the Streaming Endpoint.
+1. To configure cache headers using Azure portal, refer to [How to Manage Streaming Endpoints](/azure/media-services/latest/stream-streaming-endpoint-concept) section Configuring the Streaming Endpoint.
 2. Azure Media Services REST API, [StreamingEndpoint](/rest/api/media/operations/streamingendpoint#StreamingEndpointCacheControl).
 3. Azure Media Services .NET SDK, [StreamingEndpointCacheControl Properties](/dotnet/api/microsoft.windowsazure.mediaservices.client.streamingendpointcachecontrol).