doc: Some additional information about when to use referential actions

Peter Eisentraut <peter@eisentraut.org>

Commit: 5786fe154b53caef8b226ed863312d3608b32a51
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2021-12-01T10:25:58Z
Releases: 15.0
doc: Some additional information about when to use referential actions

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