[PostGIS] #5697: fix or document id escaping for ST_EstimatedExtent params

[PostGIS]

#5697: fix or document id escaping for ST_EstimatedExtent params
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  Reporter:  Yuri     |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:  PostGIS 3.4.3
 Component:  postgis  |    Version:  3.4.x
Resolution:           |   Keywords:
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Comment (by robe):

 Replying to [comment:5 pramsey]:
 > @robe, I dunno what you think about this one, I don't know what to put
 in doco, and in a perfect world I would go back and just change the
 function so the arguments are directly regclass arguments, but doing so
 now *might* break existing users (of which there area a lot of important
 ones, as every postgis client calls estimated extent) and would also
 involve explicitly dropping the current signature (or it would interpose
 itself on the case where a user calls using text parameters, instead of
 allowing autocasting to work its magic and convert to regclass).

 Beats me.  Do what you think is the best and we'll blame @strk for it
 after.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5697#comment:6>
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