docs: correct section of xrdp-dis

Document that xrdp-dis doen't support disconnecting xorgxrdp session.

docs/man/xrdp-dis.1

@@ -1,4 +1,4 @@
-.TH "xrdp-dis" "8" "0.9.0" "xrdp team"
+.TH "xrdp-dis" "1" "0.9.0" "xrdp team"
 .SH NAME
 xrdp\-dis \- xrdp disconnect utility
 
@@ -19,5 +19,9 @@ to get the default host and display number.
 .I /tmp/.xrdp/xrdp_disconnect_display_*
 UNIX socket used to communicate with the \fBxrdp\fP(8) session manager.
 
+.SH KNOWN ISSUES
+.TP
+This utility doesn't support disconnecting xorgxrdp sessions so far.
+
 .SH SEE ALSO
-.BR xrdp (1).
+.BR xrdp (8).