[PostGIS] #6078: Improve "raster_overviews" definition

[PostGIS]

#6078: Improve "raster_overviews" definition
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  Reporter:  Laurenz Albe  |      Owner:  pramsey
      Type:  enhancement   |     Status:  new
  Priority:  medium        |  Milestone:  PostGIS 3.6.3
 Component:  postgis       |    Version:  3.6.x
Resolution:                |   Keywords:
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Comment (by pramsey):

 I'm all in favour of smaller and faster.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6078#comment:1>
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