Merge pull request #38449 from apple/compnerd/vs-bootstrapper

Update WindowsBuild.md

Author: compnerd

docs/WindowsBuild.md

@@ -11,6 +11,7 @@ The commands below (with the exception of installing Visual Studio) must be ente
 An easy way to get most of the tools to build Swift is using the [Visual Studio installer](https://www.visualstudio.com/downloads/). This command installs all needed Visual Studio components as well as Python, Git, CMake and Ninja:
 
 ```
+curl.exe -sOL https://aka.ms/vs/16/release/vs_community.exe
 vs_community ^
   --add Component.CPython3.x64 ^
   --add Microsoft.VisualStudio.Component.Git ^
@@ -19,6 +20,7 @@ vs_community ^
   --add Microsoft.VisualStudio.Component.VC.Tools.x86.x64 ^
   --add Microsoft.VisualStudio.Component.Windows10SDK ^
   --add Microsoft.VisualStudio.Component.Windows10SDK.17763
+del /q vs_community.exe
 ```
 
 If you prefer you can install everything by hand, but make sure to include "Programming Languages|Visual C++" and "Windows and Web Development|Universal Windows App Development|Windows SDK" in your installation. The components listed above are required.