[MacPorts] #71617: guide: build fails due to error: document guide/xml/guide.xml does not validate

[MacPorts]

#71617: guide: build fails due to error: document guide/xml/guide.xml does not
validate
----------------------+--------------------
  Reporter:  mascguy  |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  guide    |    Version:
Resolution:           |   Keywords:
      Port:           |
----------------------+--------------------

Comment (by jmroot):

 According to the exit code information in `man xmllint`:
 {{{
 2
            Error in DTD
 }}}

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Ticket URL: <https://trac.macports.org/ticket/71617#comment:2>
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