doc: rename "decades" to be more generic

Bruce Momjian <bruce@momjian.us>

Commit: 973c41567f3ff1c3356a85388faa90443a9c010e
Author: Bruce Momjian <bruce@momjian.us>
Date: 2023-06-24T02:50:55Z
Releases: 11.21
doc:  rename "decades" to be more generic

Reported-by: Michael Paquier

Discussion: https://postgr.es/m/ZJTzwD2rTbHWWQ9g@paquier.xyz

Backpatch-through: 11

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

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