doc: PG 14 relnote updates

Bruce Momjian <bruce@momjian.us>

Commit: a2559d4093725592a3fd5da8a4c7ac7c883115a0
Author: Bruce Momjian <bruce@momjian.us>
Date: 2021-06-14T20:03:18Z
Releases: 14.0
doc:  PG 14 relnote updates

Reported-by: Justin Pryzby

Discussion: https://postgr.es/m/20210612034551.GU16435@telsasoft.com

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doc/src/sgml/release-14.sgml modified +111 −124

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