[MacPorts] #60331: Document compiler.cxx_standard

[MacPorts]

#60331: Document compiler.cxx_standard
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  Reporter:  iay          |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  guide        |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by ryandesign):

 The guide should be the main source of documentation unfortunately it has
 not been kept sufficiently up to date over the years and we are also in
 the middle of converting the guide from docbook to asciidoc.

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Ticket URL: <https://trac.macports.org/ticket/60331#comment:4>
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