to have the $FreeBSD$ keyword, as this is now enforced
by the CVSROOT/commit_prep.pl script.
Fold multi-word macro arguments into a single argument
by putting the surrounding double quotes - this speeds
up the -mdoc processing drastically (of course if used
systematically).
Use the new features of -mdoc: exact -width specifiers,
.In macro as an ``.Fd #include'' replacement.