Doc: improve v13 release note item about autovacuum and INSERTs.

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

Commit: 4406364e2bf421459be7bd21503da093d910e0c3
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2020-09-21T17:30:18Z
Releases: 13.0
Doc: improve v13 release note item about autovacuum and INSERTs.

The previous text was confusing, per off-list discussion with
Bruce Momjian.

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doc/src/sgml/release-13.sgml modified +20 −8

Documentation touched