man page format errors patch

[Brad Harvell <dfbrad@xxxxxxxxxxx>]

fixes for groff errors such as:

Usage: .In include_file -- In is not callable (#73)
mdoc warning: Empty input line #75
mdoc warning: list open at EOF!  A .Bl directive has no matching .El
mdoc warning: .Dx: Unknown DragonFly version `/' (#199)
mdoc warning: .Fx: Unknown FreeBSD version `/' (#134)
mdoc warning: .Fx: Unknown FreeBSD version `4.9' (#79)
mdoc warning: .Fx: Unknown FreeBSD version `5.1' (#90)

http://nibble.hp48.org/dragonfly/manpage-fixes.patch