[PostGIS] #5594: Error example in ST_LineExtend document

[PostGIS]

#5594: Error example in ST_LineExtend document
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 Reporter:  Wenjing        |      Owner:  robe
     Type:  defect         |     Status:  new
 Priority:  medium         |  Milestone:  PostGIS 3.4.1
Component:  documentation  |    Version:  3.4.x
 Keywords:                 |
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 The example of ST_Project seems mistakenly used here:
 https://postgis.net/docs/ST_LineExtend.html
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5594>
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