doc: first draft of the PG 18 release notes

Bruce Momjian <bruce@momjian.us>

Commit: a724c7889f74cc4e76e1979f90808decbc744c79
Author: Bruce Momjian <bruce@momjian.us>
Date: 2025-05-02T02:36:58Z
Releases: 18.0
doc:  first draft of the PG 18 release notes

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doc/src/sgml/release-18.sgml modified +3501 −10

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