Add description for -w/--twiddle_rit

doc/man1/rigctld.1

@@ -380,6 +380,10 @@ Should only be needed when controlling software should be "paused"
 so you can move the VFO.  Continuous movement extends the timeout.
 .
 .TP
+.BR \-w ", " \-\-twiddle_rit = \fIseconds\fP
+Suppress VFOB getfreq so RIT can be twiddled.
+.
+.TP
 .BR \-x ", " \-\-uplink = \fIoption\fP
 1=Sub, 2=Main 
 .IP