Improve docs on Persistent (DB) Connections#4897

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AllenJB wants to merge 7 commits intophp:masterfrom

AllenJB:pdo_persistent_warning

Commits on Oct 4, 2025

PDO: Add warning about (lack of) persistent connection cleanup (based on https://github.com/php/doc-en/issues/4540 )
AllenJB
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