minor fix in description of an error condition

lib/libc/gen/getdevmajor.3

@@ -1,4 +1,4 @@
-.\"	$NetBSD: getdevmajor.3,v 1.4 2009/01/20 20:08:12 drochner Exp $
+.\"	$NetBSD: getdevmajor.3,v 1.5 2009/03/24 22:34:54 drochner Exp $
 .\"
 .\" Copyright (c) 2004 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -98,7 +98,7 @@ In addition, the following errors may be reported:
 .Bl -tag -width Er
 .It Bq Er EINVAL
 The value of the
-.Fa major
+.Fa type
 argument is not
 .Dv S_IFCHR
 or