[MacPorts] #36957: Guide: Document the "subport" command

[MacPorts]

#36957: Guide: Document the "subport" command
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  Reporter:  dave@…       |      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:22 mascguy]:
 > It looks like @JDLH provided a very nice draft write-up for `subport`,
 in a subsequent reply to the thread:
 >
 > https://lists.macports.org/pipermail/macports-dev/2021-July/043629.html
 >
 > Unfortunately there were no replies. But based on a quick read-through,
 it looks pretty good!
 >
 > I'll run with that, and submit a PR for review and feedback. A link will
 be added in a subsequent comment in this ticket, once it's been created.

 PR created: [https://github.com/macports/macports-guide/pull/70 70 -
 guide: additions for subport]

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Ticket URL: <https://trac.macports.org/ticket/36957#comment:23>
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