Update docs to use `Tee-Object` in PowerShell in Windows.
Update docs to use `Tee-Object` in PowerShell in Windows.

By using `Tee-Object` you can ouput the debug log to the console and a file, which is way easier to use than just outputting to a logfile.

gitebra/vagrant,sni/vagrant,sni/vagrant,sni/vagrant,chrisroberts/vagrant,PatrickLang/vagrant,marxarelli/vagrant,crashlytics/vagrant,mitchellh/vagrant,taliesins/vagrant,PatrickLang/vagrant,marxarelli/vagrant,bryson/vagrant,bryson/vagrant,crashlytics/vagrant,PatrickLang/vagrant,mitchellh/vagrant,chrisroberts/vagrant,taliesins/vagrant,crashlytics/vagrant,marxarelli/vagrant,chrisroberts/vagrant,mitchellh/vagrant,gitebra/vagrant,marxarelli/vagrant,mitchellh/vagrant,PatrickLang/vagrant,gitebra/vagrant,bryson/vagrant,sni/vagrant,taliesins/vagrant,gitebra/vagrant,crashlytics/vagrant,bryson/vagrant,taliesins/vagrant,chrisroberts/vagrant