comment out PowerShell docs

powershell/README.md

@@ -7,11 +7,13 @@ description: |
   PowerShell is the default shell on Windows 10. Since `curl.exe | powershell` is effectively as convenient as `curl | bash` for users, and since Windows 10 also includes tar, curl.exe, and ssh, among others, you can use fairly simple PowerShell to make a variety of tasks simple for Windows developers.
 ---
 
+<!--
 For example, if you wanted to install Node.js with powershell and
 webinstall.dev, you can:
 
 ```cmd
 curl.exe -s -A "MS" https://webinstall.dev/node@lts | powershell
 ```
+-->
 
 <!-- TODO if, pipe, function -->