[Varnish] #420: Document string concatenation

[Varnish]

#420: Document string concatenation
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 Reporter:  perbu          |       Owner:       
     Type:  defect         |      Status:  new  
 Priority:  normal         |   Milestone:       
Component:  documentation  |     Version:  trunk
 Severity:  normal         |    Keywords:       
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 Hi.

 Strings can be concatenated in VCL. This is not documented in VCL.
 According to PHK on IRC strings are just concatenated like set req.foo =
 "foo" req.url "bar"; Suggested text:

 Strings are concatenated automatically. Just separate the string objects
 with spaces and they are concatenated.

 A note about where this doesn't happen would be useful. PHK?

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Ticket URL: <http://varnish.projects.linpro.no/ticket/420>
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