First-draft release notes for 18.3.

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

Commit: c5edc6c8ff4c2d6f116abbc532b1cd130fcfbc17
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2026-02-20T20:31:08Z
Releases: 18.3
First-draft release notes for 18.3.

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

Files

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doc/src/sgml/release-18.sgml modified +256 −0

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