PDF updates for the 2022-05-19 releases.

Update PDF docs for:
 * 15beta1

diff --git a/documentation/pdf/15/postgresql-15-A4.pdf b/documentation/pdf/15/postgresql-15-A4.pdf
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diff --git a/documentation/pdf/15/postgresql-15-US.pdf b/documentation/pdf/15/postgresql-15-US.pdf
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