line is optional even when logging to files.
svn:r3096
severity level is given, all messages of that level or higher will be
sent to the listed destination.
.TP
-\fBLog \fR\fIminSeverity\fR-\fImaxSeverity\fR \fBfile\fR \fIFILENAME\fP
+\fBLog \fR\fIminSeverity\fR[-\fImaxSeverity\fR] \fBfile\fR \fIFILENAME\fP
As above, but send log messages to the listed filename. The "Log"
option may appear more than once in a configuration file. Messages
are sent to all the logs that match their severity level.