Isn't clear that Powershell has to be used for installation

On [deno.com](https://deno.com/) and [docs.deno.com/runtime](https://docs.deno.com/runtime/) it's recommended to use a scripts for Windows in order to install deno, but Powershell is not the default shell instance on Windows (and usually tends to be avoided), and those two pages don't specify in any way that Powershell has to be used (unlike this [docs page](https://docs.deno.com/runtime/fundamentals/installation/)).