[PostGIS] #5950: Document the use of POSTGIS_REGRESS_DB_OWNER

[PostGIS]

#5950: Document the use of POSTGIS_REGRESS_DB_OWNER
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  Reporter:  robe           |      Owner:  robe
      Type:  defect         |     Status:  new
  Priority:  medium         |  Milestone:  PostGIS 3.5.4
 Component:  documentation  |    Version:  3.5.x
Resolution:                 |   Keywords:
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Changes (by robe):

 * milestone:  PostGIS 3.6.0 => PostGIS 3.5.4

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5950#comment:2>
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