Fix the dot-graph

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@574 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_center.c

@@ -291,7 +291,7 @@ DOT	]
 DOT	lookup -> lookup3 [style=bold]
 DOT }
 DOT lookup -> HIT [label="hit", style=bold]
-DOT lookup2 -> MISS [label="miss", style=bold]
+DOT lookup3 -> MISS [label="miss", style=bold]
  */
 
 static int