[experimental-ims] a8ac09b Add missing + in docs

[Tollef Fog Heen]

commit a8ac09bb97bc2903c0696b0af8c659bb57d851dd
Author: Tollef Fog Heen <tfheen at varnish-software.com>
Date:   Fri Apr 27 12:53:44 2012 +0200

    Add missing + in docs
    
    Thanks to Jeff Williams for pointing this out.

diff --git a/doc/sphinx/tutorial/purging.rst b/doc/sphinx/tutorial/purging.rst
index 846ca82..22056a7 100644
--- a/doc/sphinx/tutorial/purging.rst
+++ b/doc/sphinx/tutorial/purging.rst
@@ -146,7 +146,7 @@ You can use the following template to write ban lurker friendly bans::
       if (client.ip !~ purge) {
         error 401 "Not allowed";
       }
-      ban("obj.http.x-url ~ " req.url); # Assumes req.url is a regex. This might be a bit too simple
+      ban("obj.http.x-url ~ " + req.url); # Assumes req.url is a regex. This might be a bit too simple
     }
   }