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

Author: David G. Johnston <david.g.johns...@gmail.com>
Reviewed-by: Zhang Mingli <zmlpostg...@gmail.com>
Discussion: 
https://www.postgresql.org/message-id/cakfquwy0sk6jdcci1vjx6xsztrxggevey-grkenzx%2b3czpy...@mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/b4f453f6ab71eb72cb3a46a5be18e07e5cc285df

Modified Files
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doc/src/sgml/func.sgml | 5 +++++
1 file changed, 5 insertions(+)

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