[postgis-users] PostGis introduction doc code block seems wrong....

[Jian He]

23. Validity — Introduction to PostGIS
<https://postgis.net/workshops/postgis-intro/validity.html>
last code block,

-- Fix invalid and save the originalUPDATE nyc_neighborhoods
  SET geom = ST_MakeValid(geom),
      invalid_geom = geom
  WHERE NOT ST_IsValid(geom);


I think it should be:

-- Fix invalid and save the originalUPDATE nyc_neighborhoods
  SET geom = ST_MakeValid(geom),
      geom_invalid = geom
  WHERE NOT ST_IsValid(geom);
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