Doc: update v13 release notes through today, do a copy-editing pass.

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

Commit: 3965de54e718600a4703233936e56a3202caf73f
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2020-09-10T21:43:16Z
Releases: 13.0
Doc: update v13 release notes through today, do a copy-editing pass.

Also set the release date ... hopefully we won't have to change that.

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doc/src/sgml/release-13.sgml modified +351 −339

Documentation touched