From Fedora Project Wiki

The three menuitems "About GNOME", "About Fedora" and "About this computer" use up valuable menu space and are not very useful. Also, of these 3, only "About GNOME" shows some kind of effort. At least it is a dedicated window with some animation. "About Fedora" just launches yelp, and "About this computer" just launches gnome-system-monitor.