[PostGIS] #5643: Move PostGIS SFCGAL into it's own chapter

[PostGIS]

#5643: Move PostGIS SFCGAL into it's own chapter
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  Reporter:  robe           |      Owner:  robe
      Type:  enhancement    |     Status:  closed
  Priority:  medium         |  Milestone:  PostGIS 3.5.0
 Component:  documentation  |    Version:  master
Resolution:  fixed          |   Keywords:
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Comment (by Regina Obe <lr@…>):

 In [changeset:"09a3d66e7b3d6fb9d6dce20807d5641e4932e739/git" 09a3d66/git]:
 {{{#!CommitTicketReference repository="git"
 revision="09a3d66e7b3d6fb9d6dce20807d5641e4932e739"
 Fix section abstract.  References #5643 for PostGIS 3.5.0
 }}}
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5643#comment:2>
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