[MacPorts] #36957: "subport" is undocumented

[MacPorts]

#36957: "subport" is undocumented
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 Reporter:  dave@…  |      Owner:  markd@…
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  guide   |    Version:  2.1.2
 Keywords:          |       Port:
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 I find it used in a few of the official ports, but can't find anything
 about it on the portfile manpage (or any of the others).

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