[Cogsvcs] LUIS - fix link in quickstart to sample

Author: diberry

articles/cognitive-services/LUIS/includes/sdk-csharp-authoring.md

@@ -19,7 +19,7 @@ Use the Language Understanding (LUIS) authoring client library for .NET to:
 * Add features such as a phrase list
 * Train and publish app
 
-[Reference documentation](https://docs.microsoft.com/dotnet/api/overview/azure/cognitiveservices/client/languageunderstanding?view=azure-dotnet) | [Library source code](https://github.com/Azure/azure-sdk-for-net/tree/master/sdk/cognitiveservices/Language.LUIS.Authoring) | [Authoring Package (NuGet)](https://www.nuget.org/packages/Microsoft.Azure.CognitiveServices.Language.LUIS.Authoring/) | [C# Samples](https://github.com/Azure-Samples/cognitive-services-dotnet-sdk-samples/blob/master/documentation-samples/quickstarts/LUIS/LUIS.cs)
+[Reference documentation](https://docs.microsoft.com/dotnet/api/overview/azure/cognitiveservices/client/languageunderstanding?view=azure-dotnet) | [Library source code](https://github.com/Azure/azure-sdk-for-net/tree/master/sdk/cognitiveservices/Language.LUIS.Authoring) | [Authoring Package (NuGet)](https://www.nuget.org/packages/Microsoft.Azure.CognitiveServices.Language.LUIS.Authoring/) | [C# Samples](https://github.com/Azure-Samples/cognitive-services-quickstart-code/blob/master/dotnet/LanguageUnderstanding/authoring/authoring-with-sdk.cs)
 
 ## Prerequisites