[PostGIS] #5532: Improve validation of PostGIS Manual docbook

[PostGIS]

#5532: Improve validation of PostGIS Manual docbook
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  Reporter:  strk           |      Owner:  strk
      Type:  defect         |     Status:  assigned
  Priority:  medium         |  Milestone:  PostGIS 3.7.0
 Component:  documentation  |    Version:  master
Resolution:                 |   Keywords:
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Changes (by robe):

 * milestone:  PostGIS 3.6.0 => PostGIS 3.7.0

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5532#comment:6>
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