doc PG 19 relnotes: add UTF-8 case folding performance item

Bruce Momjian <bruce@momjian.us>

Commit: 12ca57bf346f1be0986f360d147bbe1a46d682db
Author: Bruce Momjian <bruce@momjian.us>
Date: 2026-05-08T00:53:41Z
doc PG 19 relnotes:  add UTF-8 case folding performance item

Reported-by: Andreas Karlsson

Discussion: https://postgr.es/m/9dae1593-4441-4a20-a1ab-ce5018db9878@proxel.se

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doc/src/sgml/release-19.sgml modified +12 −0

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