Whitespace fixes:
- break listitem tags to their own line (down from term tags)
- add an empty line between term and listitem tags
- add an empty line between consecutive varlistentry tags

This change is purely cosmetical to conform to our block element
formatting guidelines layed out in the FDP primer. It also silences
igor(8) in the standard invocation.  Translators can ignore.

Obtained from:	igor(8) output


git-svn-id: svn+ssh://svn.freebsd.org/doc/head@46055 c2e8774f-c49f-e111-b436-862b2bbc8956