doc: PG 13 relnotes: adjust partition items and attributions

Bruce Momjian <bruce@momjian.us>

Commit: 545a065880be8ccddfb116a0915bfdac0cd41902
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-05-07T13:00:24Z
Releases: 13.0
doc:  PG 13 relnotes:  adjust partition items and attributions

This merges three partition publication items into two.

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doc/src/sgml/release-13.sgml modified +10 −23

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