Thread: fix old confusing JSON example

fix old confusing JSON example

From
Erik Rijkers
Date:
Hello,

Attached is a small but confusing mistake in the json documentation (a @@ instead of @?) that has been there since
version12.  (It took me quite some time to figure that out while testing with the recent SQL/JSON patches -- which I
initiallyblamed).
 
 
To be applied from 12, 13, and master.

Thanks,

Erik Rijkers
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