Doc: update v13 release notes for changes through today.

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

Commit: bc635dd16388015c72e47a4b90c4c3ceecebb0cd
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2020-08-09T20:59:53Z
Releases: 13.0
Doc: update v13 release notes for changes through today.

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doc/src/sgml/release-13.sgml modified +115 −43

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