First-draft release notes for 15.2.

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

Commit: f282b026787da69d88a35404cf62f1cc21cfbb7c
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2023-02-03T19:30:49Z
Releases: 15.2
First-draft release notes for 15.2.

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-15.sgml modified +1293 −0

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