[MacPorts] #24897: document test.dir in guide

[MacPorts]

#24897: document test.dir in guide
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 Reporter:  ryandesign@…             |       Owner:  markd@…           
     Type:  defect                   |      Status:  new               
 Priority:  Normal                   |   Milestone:                    
Component:  guide                    |     Version:                    
 Keywords:                           |        Port:                    
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 The guide talks about other test phase variables but not test.dir

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Ticket URL: <http://trac.macports.org/ticket/24897>
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