oops, still missed a typo

src/lib/libutil/opendev.3

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: opendev.3,v 1.2 1996/06/18 09:12:03 downsj Exp $
+.\"	$OpenBSD: opendev.3,v 1.3 1996/06/18 09:13:41 downsj Exp $
 .\"
 .\" Copyright (c) 1996, Jason Downs.  All rights reserved.
 .\"
@@ -37,7 +37,7 @@
 The
 .Fn opendev
 function opens a device using the "short form" name.  This is typically
-"sd0" or "sd0c", for instance, which will be expaned to
+"sd0" or "sd0c", for instance, which will be expanded to
 .Pa /dev/rsd0c
 on most architectures.
 .Pp