Remove note that has been incorrect for a while.

Thanks ottavio for the heads up.

usr.sbin/sysinst/sysinst.8

@@ -1,4 +1,4 @@
-.\"	$NetBSD: sysinst.8,v 1.2 2020/02/19 21:51:21 martin Exp $
+.\"	$NetBSD: sysinst.8,v 1.3 2020/03/06 20:07:26 maya Exp $
 .\"
 .\" Copyright (c) 2007 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -24,7 +24,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd June 30, 2012
+.Dd March 6, 2020
 .Dt SYSINST 8
 .Os
 .Sh NAME
@@ -43,11 +43,6 @@ It
 is usually invoked automatically when the system is booted
 from appropriate installation media.
 .Pp
-.Nm
-is usually not present on a
-.Nx
-system that has been fully installed.
-.Pp
 The following options are available:
 .Bl -tag -width XfXdefinition_fileXX
 .It Fl D