[MacPorts] #18386: Guide Has No PortGroup Invocation Example

[MacPorts]

#18386: Guide Has No PortGroup Invocation Example
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  Reporter:  rmsfisher@…  |      Owner:  markd@…
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  guide        |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by egall@…):

 The PortGroup source files usually contain usage examples within the
 comments that they put at the top. I suppose one of those could be copied
 to the guide?

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Ticket URL: <https://trac.macports.org/ticket/18386#comment:5>
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