[PostGIS] #5719: Fix syntax error in documentation of ST_TransformPipeline

[PostGIS]

#5719: Fix syntax error in documentation of ST_TransformPipeline
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 Reporter:  jost           |      Owner:  robe
     Type:  defect         |     Status:  new
 Priority:  low            |  Milestone:  PostGIS 3.4.3
Component:  documentation  |    Version:  3.4.x
 Keywords:                 |
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 Fix syntax error example code in documentation of ST_TransformPipeline

 PR in GitHub repo:

 https://github.com/postgis/postgis/pull/770/files
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5719>
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