[PostGIS] #5882: ST_DistanceCPA example shows output of 2D distance. Implementation returns 3D distance.

[PostGIS]

#5882: ST_DistanceCPA example shows output of 2D distance. Implementation returns
3D distance.
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  Reporter:  siggyf         |      Owner:  robe
      Type:  defect         |     Status:  new
  Priority:  medium         |  Milestone:  PostGIS 3.5.3
 Component:  documentation  |    Version:  3.4.x
Resolution:                 |   Keywords:  CPA
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Comment (by Paul Ramsey <pramsey@…>):

 In [changeset:"569ee10b300e3a3ca4e4f79d0c8f902e1dee92f8/git" 569ee10/git]:
 {{{#!CommitTicketReference repository="git"
 revision="569ee10b300e3a3ca4e4f79d0c8f902e1dee92f8"
 Harmonize docs with results for ST_DistanceCPA, references #5882
 }}}
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5882#comment:2>
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