doc PG 17 relnotes: move FETCH_COUNT item, and clarify

Bruce Momjian <bruce@momjian.us>

Commit: 31e8f4e619d9b5856fa2bd5713cb1e2e170a9c7d
Author: Bruce Momjian <bruce@momjian.us>
Date: 2024-05-10T21:34:33Z
Releases: 17.0
doc PG 17 relnotes:  move FETCH_COUNT item, and clarify

Backpatch-through: master

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doc/src/sgml/release-17.sgml modified +11 −11

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