* postgresql_idx: improved doc, tests, remove useless lines from code (#55131)
* postgresql_idx: improve doc
* postgresql_idx: improve doc, removed unuseless rows from code
* postgresql_idx: misc doc fix
* postgresql_idx: moved common params where they were
* postgresql_idx: moved common params where they were 2
(cherry picked from commit d790285e80)
* postgresql_idx: added changelog about removing useless lines from code
