In Section 5.4.5, video cards are listed, but not enough information was given regarding their drivers.
IMO we should have something similar to this in our handbook to guide users to install
the correct drivers:
AMD/ATI xf86-video-ati catalyst-libglAUR lib32-catalyst-libglAUR AMD_Catalyst
Intel xf86-video-intel mesa lib32-mesa Intel_graphics
The full list: https://wiki.archlinux.org/index.php/xorg#Driver_installation
In /etc/make.conf the driver name from x11-drivers/xorg-drivers can be added to the argument OPTIONS_SET= , such as ATI, INTEL, VESA or NV.
OPTIONS_SET= ATI INTEL NV VESA
This, of course, doesn't cover adding it to documentation.
These are the make.conf arguments:
Options are: ATI JOYSTICK LIBINPUT VESA, AMDGPU and any other drivers listed in the Makefile
The make.conf examples in the other posting work too, but this one is more specific and proper.