some minor fixes from martin natano;

libexec/tradcpp/tradcpp.1

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: tradcpp.1,v 1.2 2014/08/08 20:50:28 jmc Exp $
+.\"	$OpenBSD: tradcpp.1,v 1.3 2014/12/02 10:21:44 jmc Exp $
 .\"
 .\" Copyright (c) 2013 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -27,7 +27,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: August 8 2014 $
+.Dd $Mdocdate: December 2 2014 $
 .Dt TRADCPP 1
 .Os
 .Sh NAME
@@ -253,9 +253,9 @@ onto the prefix given with
 .Fl iprefix
 and add this directory as if it were specified with
 .Fl idirafter .
-.It Fl iwithprefixbefore
+.It Fl iwithprefixbefore Ar dir
 Like
--Fl iwithprefix
+.Fl iwithprefix
 but adds the result as if it were specified with
 .Fl I .
 .El