doc: clarify text about combining row-level policies

Bruce Momjian <bruce@momjian.us>

Commit: cffca3665d8238dddf7afb4a3404866e375195c5
Author: Bruce Momjian <bruce@momjian.us>
Date: 2024-11-18T20:34:59Z
Releases: 18.0
doc:  clarify text about combining row-level policies

Reported-by: splarv@ya.ru

Discussion: https://postgr.es/m/173045909386.700.9231055113418242392@wrigleys.postgresql.org

Backpatch-through: master

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doc/src/sgml/ddl.sgml modified +2 −1

Documentation touched