doc: update PG history as over "three decades"

Bruce Momjian <bruce@momjian.us>

Commit: 05ffc1fadbe0ce7762b209061634b5857b36e1b8
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-06-21T23:20:07Z
Releases: 16.0
doc:  update PG history as over "three decades"

Reported-by: Pierre <pbaumard@gmail.com>

Discussion: https://postgr.es/m/168724660637.399156.7642965215720120947@wrigleys.postgresql.org

Backpatch-through: 11

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doc/src/sgml/history.sgml modified +1 −1

Documentation touched