doc: PG 14 relnotes, mention CONCURRENTLY improvements

Bruce Momjian <bruce@momjian.us>

Commit: 56d467a07de1c203cfe78fea69cd8326fa297e23
Author: Bruce Momjian <bruce@momjian.us>
Date: 2021-07-02T18:46:31Z
Releases: 14.0
doc:  PG 14 relnotes, mention CONCURRENTLY improvements

Add items for vacuum not having to wait for CONCURRENTLY, and
CONCURRENTLY not having to wait for other CONCURRENTLY operations.

Reported-by: Simon Riggs

Discussion: https://postgr.es/m/CANbhV-EMM4nf7Ys-Yae_kY25dXT_3eiOXke2+yw44jgy+4jNsA@mail.gmail.com

Backpatch-through: 14 only

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doc/src/sgml/release-14.sgml modified +39 −0

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