[PATCH] Fix whatis in Qpsmtpd.pm and Postfix.pm's POD

[Devin Carraway]

Adds a suffix to the NAME section of the POD in a couple of places;
this fixes the whatis section in manpages generated from the POD.  It's
not a big deal or a compatibility issue with perl, but it's been
triggering a lintian warning in prepping the Debian packages.