[MacPorts] #15077: Document that installing other software in /usr/local can break ports

[MacPorts]

#15077: Document that installing other software in /usr/local can break ports
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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 khindenburg@…):

 If there's still interest in this, I added this in section 2.2 before
 2.2.1

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Ticket URL: <https://trac.macports.org/ticket/15077#comment:5>
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