pgsql: Last-minute updates for release notes.

Last-minute updates for release notes.

Security: CVE-2025-8713, CVE-2025-8714, CVE-2025-8715

Branch
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REL_17_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/86ad5a84c76b0ed1cf9ddb1d88f7204a9a076051

Modified Files
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doc/src/sgml/release-17.sgml | 128 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 127 insertions(+), 1 deletion(-)