[Varnish] #221: Add a link for mod_extract_forwarded to FAQ

[Varnish]

#221: Add a link for mod_extract_forwarded to FAQ
---------------------------+------------------------------------------------
 Reporter:  nejko          |       Owner:  des  
     Type:  documentation  |      Status:  new  
 Priority:  normal         |   Milestone:       
Component:  documentation  |     Version:  trunk
 Severity:  normal         |    Keywords:       
---------------------------+------------------------------------------------
 It might be a good idea to add a link to mod_extract_forwarded for Apache
 2.0* to the answer to the question "How can I log the client IP address on
 the backend?":

 http://www.openinfo.co.uk/apache/index.html

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Ticket URL: <http://varnish.projects.linpro.no/ticket/221>
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