[MacPorts] #16355: Document port dir, port file, port edit in the Guide

[MacPorts]

#16355: Document port dir, port file, port edit in the Guide
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  Reporter:  ryandesign   |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  guide        |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by raimue):

 Note all port actions are also already documented in `port help <action>`.

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Ticket URL: <https://trac.macports.org/ticket/16355#comment:4>
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