print instructions for modifying demo tracker URL

Add some explanatory text (copied from installation.txt with minor editing)
about how to change the demo config to access the tracker from remote hosts.

Author: Justus Pendleton

demo.py

@@ -2,7 +2,7 @@
 #
 # Copyright (c) 2003 Richard Jones ([email protected])
 #
-# $Id: demo.py,v 1.25 2006-08-07 07:15:05 richard Exp $
+# $Id: demo.py,v 1.26 2007-08-28 22:37:45 jpend Exp $
 
 import errno
 import os
@@ -103,6 +103,13 @@ def run_demo(home):
 2. Hit Control-C to stop the server.
 3. Re-start the server by running "roundup-demo" again.
 4. Re-initialise the server by running "roundup-demo nuke".
+
+Demo tracker is set up to be accessed by localhost browser.  If you
+run demo on a server host, please stop the demo, open file
+"demo/config.ini" with your editor, change the host name in the "web"
+option in section "[tracker]", save the file, then re-run the demo
+program.
+
 ''' % url
 
     # disable command line processing in roundup_server