adding region callout

Author: Trevor Bye

articles/cognitive-services/Speech-Service/includes/how-to/text-to-speech-basics/text-to-speech-basics-csharp.md

@@ -48,7 +48,7 @@ There are a few ways that you can initialize a [`SpeechConfig`](https://docs.mic
 * With a host: pass in a host address. A key or authorization token is optional.
 * With an authorization token: pass in an authorization token and the associated region.
 
-In this example, you create a [`SpeechConfig`](https://docs.microsoft.com/dotnet/api/microsoft.cognitiveservices.speech.speechconfig?view=azure-dotnet) using a subscription key and region. You also create some basic boilerplate code to use for the rest of this article, which you modify for different customizations.
+In this example, you create a [`SpeechConfig`](https://docs.microsoft.com/dotnet/api/microsoft.cognitiveservices.speech.speechconfig?view=azure-dotnet) using a subscription key and region. See the [region support](https://docs.microsoft.com/azure/cognitive-services/speech-service/regions#speech-sdk) page to find your region identifier. You also create some basic boilerplate code to use for the rest of this article, which you modify for different customizations.
 
 ```csharp
 public class Program