add SEE ALSO for dirread(2)

Reference: /n/sources/patch/applied/read2-dirread-also
Date: Tue Jan 24 08:26:12 CET 2006

--- /sys/man/2/read	Tue Jan 24 08:25:46 2006
+++ /sys/man/2/read	Tue Jan 24 08:25:44 2006
@@ -88,6 +88,7 @@
 .IR intro (2),
 .IR open (2), 
 .IR dup (2),
+.IR dirread (2),
 .IR pipe (2),
 .IR readv (2)
 .SH DIAGNOSTICS