Fixes the two appearances of "#include <u.h>" in the top.

Reference: /n/sources/patch/applied/memdraw-type
Date: Sat Apr 16 11:54:48 CES 2005

--- /sys/man/2/memdraw	Sat Apr 16 11:54:34 2005
+++ /sys/man/2/memdraw	Sat Apr 16 11:54:29 2005
@@ -38,8 +38,6 @@
 .SH SYNOPSIS
 .nf
 .B #include <u.h>
-.nf
-.B #include <u.h>
 .B #include <libc.h>
 .B #include <draw.h>
 .B #include <memdraw.h>