[Cogsvcs] LUIsI - csharp SDK fix

Author: diberry

articles/cognitive-services/LUIS/sdk-csharp-quickstart-authoring-app.md

@@ -69,7 +69,7 @@ Create a new .NET Core application in your preferred editor or IDE.
 Within the application directory, install the Language Understanding (LUIS) authoring client library for .NET with the following command:
 
 ```console
-dotnet add package Microsoft.Azure.CognitiveServices.Language.LUIS.Authoring -Version 3.0.0
+dotnet add package Microsoft.Azure.CognitiveServices.Language.LUIS.Authoring --version 3.0.0
 ```
 
 If you're using the Visual Studio IDE, the client library is available as a downloadable NuGet package.