removed dead link

removed dead link

Author: MarileeTurscak-MSFT

articles/key-vault/service-to-service-authentication.md

@@ -25,7 +25,7 @@ The `Microsoft.Azure.Services.AppAuthentication` library manages authentication
 
 - [Visual Studio 2019](https://www.visualstudio.com/downloads/) or [Visual Studio 2017 v15.5](https://blogs.msdn.microsoft.com/visualstudio/2017/10/11/visual-studio-2017-version-15-5-preview/).
 
-- The [App Authentication extension for Visual Studio](https://go.microsoft.com/fwlink/?linkid=862354), available as a separate extension for Visual Studio 2017 Update 5 and bundled with the product in Update 6 and later. With Update 6 or later, you can verify the installation of the App Authentication extension by selecting Azure Development tools from within the Visual Studio installer.
+- The App Authentication extension for Visual Studio, available as a separate extension for Visual Studio 2017 Update 5 and bundled with the product in Update 6 and later. With Update 6 or later, you can verify the installation of the App Authentication extension by selecting Azure Development tools from within the Visual Studio installer.
 
 ## Using the library