First-draft release notes for 15.3.

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

Commit: 56e869a0987c93f594e73c1c3e49274de5c502d3
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2023-05-05T16:38:54Z
Releases: 15.3
First-draft release notes for 15.3.

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 +1713 −0

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