Remove mentions of obsolete devices.

share/man/man4/man4.acorn32/intro.4

@@ -1,4 +1,4 @@
-.\" $NetBSD: intro.4,v 1.1 2003/04/17 10:16:13 wiz Exp $
+.\" $NetBSD: intro.4,v 1.2 2004/03/13 19:54:32 bjh21 Exp $
 .\"
 .\" Copyright (c) 1995 Mark Brinicombe
 .\" Copyright (c) 1994 Christopher G. Demetriou
@@ -29,7 +29,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd July 5, 2000
+.Dd March 13, 2004
 .Dt INTRO 4 acorn32
 .Os
 .Sh NAME
@@ -98,12 +98,8 @@ the system.  Devices are indicated by their functional interface.
 Not all supported devices are listed.
 .Pp
 .Bl -tag -width speaker -offset indent -compact
-.It beep
-VIDC20 beep device interface
 .It vidcvideo
 VIDC20 device interface
-.It rd
-Ramdisk device interface
 .It com
 NS8250-, NS16450-, and NS16550-based asynchronous serial
 communications device interface