File README.updates of Package xorg-x11-server

Xserver module update mechanism
-------------------------------

If any corresponding Xserver module is found below
"/usr/lib/xorg/modules/updates/" ("/usr/lib64/xorg/modules/updates/"
on biarch 32/64 bit platforms) it will be favored over the one in
"/usr/lib/xorg/modules/" ("/usr/lib64/xorg/modules/" on biarch 32/64
bit platforms).