[Varnish] #721: hash and client director docs.

[Varnish]

#721: hash and client director docs.
---------------------------+------------------------------------------------
 Reporter:  perbu          |       Owner:       
     Type:  documentation  |      Status:  new  
 Priority:  normal         |   Milestone:       
Component:  build          |     Version:  trunk
 Severity:  normal         |    Keywords:  perbu
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 Document the "hash" and "client" directors in the VCL man page.

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Ticket URL: <http://varnish-cache.org/ticket/721>
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