vlogger.8: fix mdoc warnings

Author: Duncaen

vlogger.8

@@ -1,6 +1,6 @@
 .Dd March 1, 2017
 .Dt VLOGGER 8
-.Os Linux
+.Os
 .Sh NAME
 .Nm vlogger
 .Nd log messages to syslog or an arbitrary executable
@@ -75,7 +75,7 @@ can not be used from userspace replaced with
 .It local[0-7]
 .It security
 deprecated synonym for
-.Pa auth.
+.Pa auth .
 .El
 .Sh LEVELS
 .Bl -tag -width 11n -compact
@@ -124,7 +124,7 @@ This program is a replacement for the
 .Nm logger
 utility provided by
 .Nm util-linux .
-.Sh AUTHOR
+.Sh AUTHORS
 .An Duncan Overbruck Aq Mt mail@duncano.de
 .Sh LICENSE
 .Nm