[MacPorts] #16168: document test.env in the guide

[MacPorts]

#16168: document test.env in the guide
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  Reporter:  ryandesign@…             |       Owner:  markd@…                
      Type:  defect                   |      Status:  closed                 
  Priority:  Normal                   |   Milestone:  Website & Documentation
 Component:  guide                    |     Version:  1.6.0                  
Resolution:  fixed                    |    Keywords:                         
      Port:                           |  
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Changes (by raimue@…):

  * status:  new => closed
  * resolution:  => fixed


Comment:

 build.env and test.env documented in r47199.

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Ticket URL: <http://trac.macports.org/ticket/16168#comment:1>
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