doc: first draft of the PG 14 release notes

Bruce Momjian <bruce@momjian.us>

Commit: dc0260861063b125d297c0f3caca359feb381c6a
Author: Bruce Momjian <bruce@momjian.us>
Date: 2021-05-10T05:58:59Z
Releases: 14.0
doc:  first draft of the PG 14 release notes

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doc/src/sgml/release-14.sgml modified +3373 −4

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