This experimental commit removes all $FreeBSD$ strings from the FDP
Primer because these continually-changing strings interfere with PO
translations. They text version in the file is also potentially
inaccurate. The FreeBSD=%H property has also been removed from these
files, although without $FreeBSD$ strings, it has no effect. The
fbsd:nokeywords property has been set to "yes" to allow the commit.
NO INFORMATION HAS BEEN LOST. The version control information is stored
in the metadata and can be retrieved with 'svn info [file]'.