doc PG 18 relnotes: update to current

Bruce Momjian <bruce@momjian.us>

Commit: 1ca583f6c0f9c178dd2721886c723791ced65520
Author: Bruce Momjian <bruce@momjian.us>
Date: 2025-05-23T20:01:07Z
Releases: 18.0
doc PG 18 relnotes:  update to current

Includes runtime injection point item by Michael Paquier.

Reported-by: Michael Paquier

Author: Michael Paquier

Discussion: https://postgr.es/m/aDAS0_eWzeGl4sok@paquier.xyz

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doc/src/sgml/release-18.sgml modified +20 −2

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