Update the manpage to better describe the io redirection on BGQ system.

doc/man/man1/srun.1

@@ -1548,8 +1548,7 @@ a terminal is not possible.
 .PP
 For BGQ srun only supports stdin to 1 task running on the system.  By
 default it is taskid 0 but can be changed with the \-i<taskid> as
-described below, or \-\-launcher\-opts="\-\-stdinrank=<taskid>".  Outside
-of the taskid option none of the options below are available for a BGQ system.
+described below, or \-\-launcher\-opts="\-\-stdinrank=<taskid>".
 .PP
 This behavior may be changed with the
 \fB\-\-output\fR, \fB\-\-error\fR, and \fB\-\-input\fR
@@ -1590,7 +1589,8 @@ unique to a given jobid, stepid, node, or task. In each case,
 the appropriate number of files are opened and associated with
 the corresponding tasks. Note that any format string containing
 %t, %n, and/or %N will be written on the node executing the task
-rather than the node where \fBsrun\fR executes.
+rather than the node where \fBsrun\fR executes, these format specifiers
+are not supported on a BGQ system.
 .RS 10
 .TP
 %J