[Sync EN] pdo_pgsql: document ATTR_PREFETCH lazy fetch, fix copyFromArray sig (#5629)

[github-actions]

Commit: https://github.com/php/doc-en/commit/205c3b8ad9af665e2b49dcc6020005bb479217a3
PR: https://github.com/php/doc-en/pull/5629

Archivos ES a actualizar

• reference/pdo/constants.xml
• reference/pdo_pgsql/pdo-pgsql.xml
• reference/pdo_pgsql/pdo/pgsql/copyfromarray.xml