doc: clearify trigger behavior for inheritance

Bruce Momjian <bruce@momjian.us>

Commit: 5b648388b832620af403ad9cafae04eee46bd49f
Author: Bruce Momjian <bruce@momjian.us>
Date: 2018-01-31T22:00:17Z
Releases: 10.2
doc:  clearify trigger behavior for inheritance

The previous wording added in PG 10 wasn't specific enough about the
behavior of statement and row triggers when using inheritance.

Reported-by: ian@thepathcentral.com

Discussion: https://postgr.es/m/20171129193934.27108.30796@wrigleys.postgresql.org

Backpatch-through: 10

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doc/src/sgml/ref/create_trigger.sgml modified +3 −2

Documentation touched