doc: Remove link to JSON support in the SQL specification
The link used in the documentation is dead, and the only options to have
an access to this part of the SQL specification are not free. Like any
other books referred, just remove the link to keep some neutrality but
keep its reference.
Reported-by: Erik Rijkers
Discussion: https://postgr.es/m/989abd7d-af30-ab52-1201-bf0b4f33b872@xs4all.nl
Backpatch-through: 12
Branch
------
REL_13_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/1105efdc1bba91a60551feae0342ba5973fa69ba
Modified Files
--------------
doc/src/sgml/biblio.sgml | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)