For some video chipsets to work in the Beta, people need to use X drivers from XFree86 3.3.6, however the only man page installed for XF86Config is the one for X 4.0.1 Unfortunately the XF86Config files are not 100% compatible between the versions. (ie DefaultColorDepth became DefaultDepth) Sense the Xservers are included, the man page for their XF86Config files should also so that people who edit them by hand have documentation. You might want to have the man page be named so that its accessible as 'man XF86Config-336' or something similar so that you don't have conflicting man page names.
Fixed in XFree86-Servers-3.3.6-33.