[MacPorts] #64329: guide and portfile man page: document missing keywords

[MacPorts]

#64329: guide and portfile man page: document missing keywords
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  Reporter:  mascguy      |      Owner:  mascguy
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  guide        |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by mascguy):

 Replying to [comment:8 mascguy]:
 > PR created, to document keyword `use_dmg` in the manpage for `portfile`:
 >
 > [https://github.com/macports/macports-base/pull/295 PR 295 - manpages:
 portfile: document keyword use_dmg]

 Corresponding PR created, to update the MacPorts Guide:

 [https://github.com/macports/macports-guide/pull/61 PR 61 - guide: phase:
 document keyword use_dmg]

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Ticket URL: <https://trac.macports.org/ticket/64329#comment:9>
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