doc: Fix typo in example query of SQL/JSON

Michael Paquier <michael@paquier.xyz>

Commit: 254a2164e5b216ecf98882f8bcb9e239ab2d432d
Author: Michael Paquier <michael@paquier.xyz>
Date: 2021-04-16T07:56:12Z
Releases: 14.0
doc: Fix typo in example query of SQL/JSON

Author: Erik Rijkers
Discussion: https://postgr.es/m/1219476687.20432.1617452918468@webmailclassic.xs4all.nl
Backpatch-through: 12

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doc/src/sgml/json.sgml modified +1 −1

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