message: template: add Powershell command to get OS version
  As `ver` doesn't work.
diff: @@ -35,7 +35,7 @@ Please use this form and describe your issue, concisely but precisely, with as m
  # Environment
  ```none
  -Windows build number: [run "ver" at a command prompt]
  +Windows build number: [run `[Environment]::OSVersion` for powershell, or `ver` for cmd]
  Windows Terminal version (if applicable):
  Any other software?
  