doc: update PG 14 release notes with recent feedback

Bruce Momjian <bruce@momjian.us>

Commit: 5eb1b27d20670b378508391fab01a6871a86a8e9
Author: Bruce Momjian <bruce@momjian.us>
Date: 2021-05-14T17:01:12Z
Releases: 14.0
doc:  update PG 14 release notes with recent feedback

Reported-by: Justin Pryzby

Discussion: https://postgr.es/m/20210514020141.GQ27406@telsasoft.com

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doc/src/sgml/release-14.sgml modified +25 −1

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