First-draft release notes for 13.3.

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

Commit: 7f4bab7f4a0e42ee9fa14707f726017b7869386b
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2021-05-07T16:19:41Z
Releases: 13.3
First-draft release notes for 13.3.

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

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doc/src/sgml/release-13.sgml modified +979 −0

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