Added path to diffy's source.

Thanks.
Arvindh

Reference: /n/sources/patch/applied/diffy-man
Date: Fri Apr 14 09:01:15 CES 2006
Signed-off-by: arvindht@gmail.com

--- /sys/man/1/yesterday	Fri Apr 14 09:00:35 2006
+++ /sys/man/1/yesterday	Fri Apr 14 09:00:27 2006
@@ -13,7 +13,7 @@
 ]
 .I files ...
 .PP
-.I diffy
+.B diffy
 [
 .B -abcefmnrw
 ]
@@ -145,6 +145,8 @@
 .B /n/dump
 .SH SOURCE
 .B /rc/bin/yesterday
+.br
+.B /rc/bin/diffy
 .SH SEE ALSO
 .IR history (1),
 .IR bind (1),