Doc: update v15 release notes through today.

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

Commit: e956325c8bc8c7257b04c322bf996fff2d81b514
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2022-09-23T17:59:55Z
Releases: 15.0
Doc: update v15 release notes through today.

Account for commits since 2022-06-11.

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doc/src/sgml/release-15.sgml modified +180 −43

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