[MacPorts] #58338: lots-o-ports: decide on common variant name to build documentation: +docs or +doc

[MacPorts]

#58338: lots-o-ports: decide on common variant name to build documentation: +docs
or +doc
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  Reporter:  blair    |      Owner:  michaelld
      Type:  request  |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  cmake    |
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Comment (by michaelld):

 I will add on the ports here as best I can, and which uses which variant.

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Ticket URL: <https://trac.macports.org/ticket/58338#comment:3>
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