[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:
Component:  documentation  |    Version:  3.5.x
 Keywords:                 |
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 During PostGIS Day 2025, I asked a question about how vector
 simplification works when producing MVT geometries in PostGIS.

 Paul Ramsey suggested I raised a ticket suggesting additional
 documentation on this, which could be added to the docs for the
 ST_AsMVTGeom function, or anywhere else appropriate.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6022>
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