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

diff --git a/doc/src/sgml/biblio.sgml b/doc/src/sgml/biblio.sgml
index 73a21b6add1b2e9e2ffb1d38c55df278ad569a7d..cd8aa3e8aadc8ea22245dab7cabc9d179b64c63a 100644 (file)
--- a/doc/src/sgml/biblio.sgml
+++ b/doc/src/sgml/biblio.sgml
@@ -137,7 +137,7 @@
    
 
    
-    <span class="marked"><ulink url="https://standards.iso.org/ittf/PubliclyAvailableStandards/c067367_ISO_IEC_TR_19075-6_2017.zip">SQL Technical Report</ulink></span>
+    <span class="marked">SQL Technical Report</span>
     Part 6: SQL support for JavaScript Object
       Notation (JSON)
     First Edition