Updated man page

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@1762 d4fa192b-c00b-0410-8231-f00ffab90ce4

man/vcl.7

@@ -136,6 +136,9 @@ is replaced with the entire matched string, and
 is replaced with the contents of subgroup
 .Ar n
 in the matched string.
+.It Fn purge "regex"
+Purge all objects in cache matching 
+.Fa regex .
 .El
 .Ss Subroutines
 A subroutine is used to group code for legibility or reusability: