[MacPorts] #59639: Docs: extract keyword "use_dmg" seems undocumented

[MacPorts]

#59639: Docs: extract keyword "use_dmg" seems undocumented
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 Reporter:  lhaeger  |      Owner:  (none)
     Type:  request  |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  website  |    Version:
 Keywords:  use_dmg  |       Port:
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 Several ports use the "use_dmg yes" keyword, which is not documented on
 https://guide.macports.org/chunked/reference.phases.html

 Please update the above page so maintainers become aware of it.

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Ticket URL: <https://trac.macports.org/ticket/59639>
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