fix wording

Author: PatrickFarley

articles/cognitive-services/Face/QuickStarts/csharp-sdk.md

@@ -38,7 +38,7 @@ Azure Cognitive Services are represented by Azure resources that you subscribe t
 * Get a [trial key](https://azure.microsoft.com/try/cognitive-services/#decision) valid for seven days for free. After you sign up, it will be available on the [Azure website](https://azure.microsoft.com/try/cognitive-services/my-apis/).  
 * View your resource on the [Azure portal](https://portal.azure.com/).
 
-After you get a key from your trial subscription or resource, [create an environment variable](https://docs.microsoft.com/azure/cognitive-services/cognitive-services-apis-create-account#configure-an-environment-variable-for-authentication) for the key and endpoint URL, named `FACE_SUBSCRIPTION_KEY` and `FACE_ENDPOINT`, respectively.
+After you get a key from your trial subscription or resource, [create environment variables](https://docs.microsoft.com/azure/cognitive-services/cognitive-services-apis-create-account#configure-an-environment-variable-for-authentication) for the key and endpoint URL, named `FACE_SUBSCRIPTION_KEY` and `FACE_ENDPOINT`, respectively.
 
 ### Create a new C# application