relnotes: update AS OF date

Bruce Momjian <bruce@momjian.us>

Commit: 4d3b4d7bfa39420c12dd8af9269a5b68f006011f
Author: Bruce Momjian <bruce@momjian.us>
Date: 2022-06-11T18:59:18Z
Releases: 15.0
relnotes:  update AS OF date

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doc/src/sgml/release-15.sgml modified +1 −1

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