[MacPorts] #16118: Add documentation for `port gohome`

[MacPorts]

#16118: Add documentation for `port gohome`
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  Reporter:  raimue at macports.org  |       Owner:  markd at macports.org     
      Type:  enhancement          |      Status:  new                    
  Priority:  Normal               |   Milestone:  Website & Documentation
 Component:  guide                |     Version:                         
Resolution:                       |    Keywords:  gohome documentation   
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Comment (by blb at macports.org):

 Updated diff adding descriptions of load and unload; thanks Ryan.

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Ticket URL: <http://trac.macports.org/ticket/16118#comment:4>
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