[MacPorts] #16930: more explanation in the guide for startupitems

[MacPorts]

#16930: more explanation in the guide for startupitems
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  Reporter:  dweber@…     |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  guide        |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by raimue):

 See also #22449.

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Ticket URL: <https://trac.macports.org/ticket/16930#comment:4>
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