[MacPorts] #55448: Document github portgroup in guide

[MacPorts]

#55448: Document github portgroup in guide
---------------------------+--------------------
  Reporter:  emcrisostomo  |      Owner:
      Type:  enhancement   |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  guide         |    Version:
Resolution:  fixed         |   Keywords:
      Port:                |
---------------------------+--------------------
Changes (by ryandesign):

 * status:  new => closed
 * type:  defect => enhancement
 * resolution:   => fixed


Comment:

 Thanks! The PR was merged.

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Ticket URL: <https://trac.macports.org/ticket/55448#comment:3>
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