Be more specific about necessary configuration when using Xorg in a
VirtualBox FreeBSD guest.

PR:		190829
Submitted by:	Steven Doerfler <sgd-freebsdbugzilla@lugaru.com>
Add more missing manual pages from head/, stable/10/, and
stable/9/ that were excluded from the previous change
because of local make.conf(5) and src.conf(5) entries.

Sponsored by:	The FreeBSD Foundation