docs: Clarify that NULL arg to set_config() means reset to default

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: b4f453f6ab71eb72cb3a46a5be18e07e5cc285df
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2025-04-04T12:17:17Z
Releases: 18.0
docs: Clarify that NULL arg to set_config() means reset to default

Author: David G. Johnston <david.g.johnston@gmail.com>
Reviewed-by: Zhang Mingli <zmlpostgres@gmail.com>
Discussion: https://www.postgresql.org/message-id/CAKFQuwY0SK6JdCci1VJX6xsztRXgGeVEY-grkENZx%2B3CZpyPcQ@mail.gmail.com

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