Mention that strings use %xx escapes in VCL.

Closes 252



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@2746 d4fa192b-c00b-0410-8231-f00ffab90ce4

man/vcl.7

@@ -57,7 +57,7 @@ In addition to the C-like assignment (=), comparison (==) and boolean
 matching using the ~ operator.
 .Pp
 Unlike C and Perl, the backslash (\\) character has no special meaning
-in strings in VCL,
+in strings in VCL, which use the (%xx) escape mechanism just like URLs,
 so it can be freely used in regular expressions without doubling.
 .Pp
 Assignments are introduced with the