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

[MacPorts]

#16118: Add documentation `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:                         
 Keywords:  gohome documentation  |  
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 The command `port gohome` is not documented, neither in the guide nor in
 the man page.

 It was added in r24551.

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