Add 12beta1 PDFs

diff --git a/documentation/pdf/12/postgresql-12-A4.pdf b/documentation/pdf/12/postgresql-12-A4.pdf
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diff --git a/documentation/pdf/12/postgresql-12-US.pdf b/documentation/pdf/12/postgresql-12-US.pdf
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Binary files /dev/null and b/documentation/pdf/12/postgresql-12-US.pdf differ