Update docs for running ps1 setup script from within PowerShell

In order to avoid problems with PowerShell Execution policies

Author: Dimitar Kerezov

setup/native-script.ps1

@@ -4,7 +4,7 @@
 # To run it inside a COMMAND PROMPT against the production branch (only one supported with self-elevation) use
 # @powershell -NoProfile -ExecutionPolicy Bypass -Command "iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/NativeScript/nativescript-cli/production/setup/native-script.ps1'))"
 # To run it inside a WINDOWS POWERSHELL console against the production branch (only one supported with self-elevation) use
-# iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/NativeScript/nativescript-cli/production/setup/native-script.ps1'))
+# start-process -FilePath PowerShell.exe -Verb Runas -Wait -ArgumentList "-NoProfile -ExecutionPolicy Bypass -Command iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/NativeScript/nativescript-cli/production/setup/native-script.ps1'))"
 
 # Check if latest .NET framework installed is at least 4
 $dotNetVersions = Get-ChildItem 'HKLM:\SOFTWARE\Microsoft\NET Framework Setup\NDP' -recurse | Get-ItemProperty -name Version,Release -EA 0 | Where { $_.PSChildName -match '^(?!S)\p{L}'} | Select Version