[postgis-tickets] [PostGIS] #4764: Doc update

[PostGIS]

#4764: Doc update
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 Reporter:  geozelot       |      Owner:  robe
     Type:  patch          |     Status:  new
 Priority:  medium         |  Milestone:
Component:  documentation  |    Version:  master
 Keywords:  docs           |
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 Slight improvements to the {{{ST_AsGeoJSON}}} docs.

 See attached {{{doc.patch}}} file.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4764>
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