It means that the user read the SNB manual and determined which register and the appropriate code to make the aspect ratio and brightness look better. It will still be 1024x768 so at this point its not a big change. If you don't know how to follow the steps listed in the attachment, I wouldn't worry. Its not a huge deal.
Also, the submitted script is unnecessarily complicated for Ubuntu users; for example, you can change the brightness by:
sudo add-apt-repository ppa:xorg-edgers/ppa
sudo aptitude update -q2
sudo aptitude install intel-gpu-tools
sudo intel_backlight 50