doc: update PG 14 release notes based on feedback so far

Bruce Momjian <bruce@momjian.us>

Commit: ff51679220ce31091bfdbc96d2e90fc02ac6f329
Author: Bruce Momjian <bruce@momjian.us>
Date: 2021-05-11T03:56:47Z
Releases: 14.0
doc:  update PG 14 release notes based on feedback so far

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doc/src/sgml/release-14.sgml modified +62 −46

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