OS-2288 there is no dialup, only zuul

*** 75,85 ****
  .ne 2
  .na
  \fB\fB-y\fR\fR
  .ad
  .RS 6n
! Halt the system, even from a dialup terminal.
  .RE
  
  .SH FILES
  .sp
  .ne 2
--- 75,85 ----
  .ne 2
  .na
  \fB\fB-y\fR\fR
  .ad
  .RS 6n
! This option is ignored for backwards compatibility.
  .RE
  
  .SH FILES
  .sp
  .ne 2