[PostGIS] #4332: Improve Doc Function Reference categories

[PostGIS]

#4332: Improve Doc Function Reference categories
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  Reporter:  mdavis         |      Owner:  mdavis
      Type:  enhancement    |     Status:  closed
  Priority:  medium         |  Milestone:  PostGIS 3.7.0
 Component:  documentation  |    Version:  master
Resolution:  fixed          |   Keywords:
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Changes (by komzpa):

 * milestone:  PostGIS Fund Me => PostGIS 3.7.0

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4332#comment:26>
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