doc: Add additional SQL features codes from SQL:2023

Peter Eisentraut <peter@eisentraut.org>

Commit: 1c77de98017022e45a0b12ddb71e202d55551f68
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2023-04-17T14:06:41Z
Releases: 16.0
doc: Add additional SQL features codes from SQL:2023

These were mysteriously omitted in c9f57541d9.

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src/backend/catalog/sql_features.txt modified +2 −0