[PostGIS] #3425: Clarify PostGIS handling of repeated points wrt validity in docs

[PostGIS]

#3425: Clarify PostGIS handling of repeated points wrt validity in docs
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  Reporter:  dbaston        |      Owner:  Darafei Praliaskouski <me@…>
      Type:  enhancement    |     Status:  closed
  Priority:  low            |  Milestone:  PostGIS Fund Me
 Component:  documentation  |    Version:  master
Resolution:  fixed          |   Keywords:
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Comment (by Darafei Praliaskouski <me@…>):

 In [changeset:"06dfb605f3184c6c23c352e0ed37fb785a2da343/git" 06dfb60/git]:
 {{{#!CommitTicketReference repository="git"
 revision="06dfb605f3184c6c23c352e0ed37fb785a2da343"
 doc: explain repeated ring point validity

 Explain why consecutive repeated coordinates in a polygon boundary ring
 are treated as redundant vertices under the SFS curve model.

 References
 https://github.com/postgis/postgis/pull/1017#discussion_r3448971304

 References #3425
 }}}
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3425#comment:9>
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