[PostGIS] #6022: Add documentation on simplification performed by ST_AsMVTGeom

[PostGIS]

#6022: Add documentation on simplification performed by ST_AsMVTGeom
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  Reporter:  robintw        |      Owner:  robe
      Type:  enhancement    |     Status:  new
  Priority:  medium         |  Milestone:  PostGIS 3.7.0
 Component:  documentation  |    Version:  3.5.x
Resolution:                 |   Keywords:
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Changes (by pramsey):

 * milestone:   => PostGIS 3.7.0

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6022#comment:1>
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