First-draft release notes for 16.4.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: ee219ee8c40d88e7a0ef52c3c1b76c90bbd0d164
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2024-08-02T20:24:17Z
Releases: 16.4
First-draft release notes for 16.4.

As usual, the release notes for other branches will be made by cutting
these down, but put them up for community review first.

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doc/src/sgml/release-16.sgml modified +1239 −0

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