[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
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  Reporter:  mascguy  |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  guide    |    Version:
Resolution:           |   Keywords:
      Port:           |
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Comment (by mascguy):

 The failed buildbot job is: https://build.macports.org/builders/jobs-
 guide/builds/142

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Ticket URL: <https://trac.macports.org/ticket/71617#comment:1>
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