Broken link fixed

Author: pritamso

articles/cognitive-services/Speech-Service/how-to-custom-speech-train-model.md

@@ -230,7 +230,7 @@ Copying a model directly to a project in another region is not supported with th
 
 ::: zone pivot="rest-api"
 
-To copy a model to another Speech resource, use the CopyModelToSubscriptionToSubscription operation of the [Speech-to-text REST API](rest-speech-to-text.md). Construct the request body according to the following instructions:
+To copy a model to another Speech resource, use the [CopyModelToSubscriptionToSubscription](https://eastus.dev.cognitive.microsoft.com/docs/services/speech-to-text-api-v3-0/operations/CopyModelToSubscription) operation of the [Speech-to-text REST API](rest-speech-to-text.md). Construct the request body according to the following instructions:
 
 - Set the required `targetSubscriptionKey` property to the key of the destination Speech resource.