Fixed link to .NET Core SDK (#24147)

Author: YohDeadfall

Documentation/building/windows-instructions.md

@@ -88,7 +88,7 @@ Powershell version must be 3.0 or higher. This should be the case for Windows 8
 ## DotNet Core SDK
 While not strictly needed to build or test the .NET Core repository, having the .NET Core SDK installed lets you use the dotnet.exe command to run .NET Core applications in the 'normal' way.   We use this in the 
 [Using Your Build](../workflow/UsingYourBuild.md) instructions.  Visual Studio should have
-installed the .NET Core SDK, but in case it did not you can get it from the [Installing the .NET Core SDK](https://www.microsoft.com/net/core) page.  
+installed the .NET Core SDK, but in case it did not you can get it from the [Installing the .NET Core SDK](https://dotnet.microsoft.com/download) page.  
 
 ## Adding to the default PATH variable