Merge pull request #32016 from apple/martinboehme-patch-2

Update WindowsBuild.md

Author: martinboehme

docs/WindowsBuild.md

@@ -1,6 +1,6 @@
 # Building Swift on Windows
 
-Visual Studio 2017 or newer is needed to build Swift on Windows.
+Visual Studio 2017 or newer is needed to build Swift on Windows. The free Community edition is sufficient to build Swift.
 
 The commands below (with the exception of installing Visual Studio) must be entered in the "**x64 Native** Tools Command Prompt for VS2017" (or VS2019, VS2019 Preview depending on the Visual Studio that you are using) in the Start Menu. This sets environment variables to select the correct target platform.