Fix rigctld man page to show numeric only return for chk_vfo

This was changed to maintain compatibility with previous versions

doc/man1/rigctld.1

@@ -1080,11 +1080,11 @@ VFO parameter is not used in VFO mode.
 .
 .TP
 .B chk_vfo
-Returns \(lqCHKVFO 1\\n\(rq (single line only) if
+Returns \(lq1\\n\(rq (single line only) if
 .B rigctld
 was invoked with the
 .BR \-o / \-\-vfo
-option and \(lqCHKVFO 0\\n\(rq if not.
+option and \(lq0\\n\(rq if not.
 .IP
 When in VFO mode the client will need to pass
 .RI \(aq VFO \(aq