[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 Christopher Nielsen <mascguy@…>):

 In [changeset:"91fb998d149a3d2b78e3a0e32b93aab9f6481918/macports-base"
 91fb998d149a3d2b78e3a0e32b93aab9f6481918/macports-base] (master):
 {{{
 #!ConfigurableCommitTicketReference repository="macports-base"
 revision="91fb998d149a3d2b78e3a0e32b93aab9f6481918"
 manpages: portfile: document keyword use_dmg

 Fixes: https://trac.macports.org/ticket/56036
 See: https://trac.macports.org/ticket/64329
 }}}

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Ticket URL: <https://trac.macports.org/ticket/64329#comment:21>
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