[MacPorts] #25189: supported_archs is not documented in man portfile

[MacPorts]

#25189: supported_archs is not documented in man portfile
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 Reporter:  blair@…             |       Owner:  markd@…           
     Type:  defect              |      Status:  new               
 Priority:  Normal              |   Milestone:                    
Component:  guide               |     Version:  1.9.0             
 Keywords:                      |        Port:                    
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 Per request of Ryan, I've recently been updating ports
 to use "supported_archs noarch", but this isn't documented
 in "man portfile".

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Ticket URL: <http://trac.macports.org/ticket/25189>
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