[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:  closed
  Priority:  medium         |  Milestone:  PostGIS 3.7.0
 Component:  documentation  |    Version:  3.5.x
Resolution:  fixed          |   Keywords:
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Changes (by Darafei Praliaskouski <me@…>):

 * resolution:   => fixed
 * status:  new => closed

Comment:

 In [changeset:"c451c27eb8cd4e52d66e281f1178d0b542d6be1a/git" c451c27/git]:
 {{{#!CommitTicketReference repository="git"
 revision="c451c27eb8cd4e52d66e281f1178d0b542d6be1a"
 doc: document ST_AsMVTGeom tile-coordinate simplification

 Clarify that ST_AsMVTGeom simplifies only within tile coordinate space by
 snapping to the integer grid, removing repeated points, and removing
 collinear points after transformation. Direct callers to run explicit map-
 coordinate simplification before tile conversion when they need broader
 detail reduction.

 Closes #6022

 Closes https://github.com/postgis/postgis/pull/983
 }}}
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6022#comment:2>
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