Document the version drvctl appeard.

Reword bad sentence.
Remove space in License.
Bump date.

sbin/drvctl/drvctl.8

@@ -1,7 +1,7 @@
-.\" $NetBSD: drvctl.8,v 1.17 2015/08/08 07:52:52 mrg Exp $
+.\" $NetBSD: drvctl.8,v 1.18 2016/09/11 02:59:11 sevan Exp $
 .\"
 .\" Copyright (c) 2004
-.\" 	Matthias Drochner.  All rights reserved.
+.\"	Matthias Drochner.  All rights reserved.
 .\"
 .\" Redistribution and use in source and binary forms, with or without
 .\" modification, are permitted provided that the following conditions
@@ -24,7 +24,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd August 8, 2015
+.Dd September 11, 2016
 .Dt DRVCTL 8
 .Os
 .Sh NAME
@@ -62,7 +62,7 @@ The
 .Nm
 program works with the
 .Xr drvctl 4
-pseudo-driver, and allows to rescan busses and to detach
+pseudo-driver to allow the rescan of busses and to detach
 drivers from devices.
 .Pp
 The following options are available:
@@ -161,6 +161,11 @@ attribute:
 .Xr proplib 3 ,
 .Xr drvctl 4 ,
 .Xr autoconf 9
+.Sh HISTORY
+A
+.Nm
+utility appeard in
+.Nx 4.0 .
 .Sh BUGS
 Currently, there is no good way to get information about locator
 lengths and default values (which is present at kernel configuration