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Commit f40c6969d0 added the information schema usage tables but added documentation that they did not fully work yet. Commit e717a9a18b then added SQL-standard function bodies, which made the information schema views fully functional, but it neglected to update the documentation. This is now done here. Reported-by: Erki Eessaar <erki.eessaar@taltech.ee> Reviewed-by: Erki Eessaar <erki.eessaar@taltech.ee> Discussion: https://www.postgresql.org/message-id/flat/AM9PR01MB8268EC7B696F9FE346CA5B93FEB8A%40AM9PR01MB8268.eurprd01.prod.exchangelabs.com