[MacPorts] #56036: use_dmg is not documented in guide and portfile(7)

[MacPorts]

#56036: use_dmg is not documented in guide and portfile(7)
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 Reporter:  raimue       |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  guide        |    Version:
 Keywords:               |       Port:
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Ticket URL: <https://trac.macports.org/ticket/56036>
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