[MacPorts] #14540: Document -devel ports

[MacPorts]

#14540: Document -devel ports
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  Reporter:  ryandesign@…  |      Owner:  markd@…
      Type:  enhancement   |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  guide         |    Version:  1.6.0
Resolution:                |   Keywords:
      Port:                |
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Changes (by ryandesign@…):

 * cc: egall@… (added)


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Ticket URL: <https://trac.macports.org/ticket/14540#comment:6>
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