Minor language nitpick for saintmode_threshold

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@4337 d4fa192b-c00b-0410-8231-f00ffab90ce4

man/vcl.7so

@@ -121,8 +121,8 @@ backend www {
 }
 .Ed
 .Pp
-To stop using a backend after number of items have been added to it's
-saintmode list 
+To mark a backend as unhealthy after number of items have been added to
+it's saintmode list 
 .Fa .saintmode_threshold
 can be set to the maximum list size. Setting a value of 0 disables
 saintmode checking entirely for that backend. The value in the backend