OS-2288 there is no dialup, only zuul

@@ -75,11 +75,11 @@
 .ne 2
 .na
 \fB\fB-y\fR\fR
 .ad
 .RS 6n
-Halt the system, even from a dialup terminal.
+This option is ignored for backwards compatibility.
 .RE
 
 .SH FILES
 .sp
 .ne 2