doc: first draft of the PG 16 release notes

Bruce Momjian <bruce@momjian.us>

Commit: 206a67e27fa15d75bd7b9ddf41d7e18d19bbb9db
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-05-18T20:00:04Z
Releases: 16.0
doc:  first draft of the PG 16 release notes

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doc/src/sgml/release-16.sgml modified +3037 −10

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