doc: remove pg_config mention from PG 12 release notes

Reported-by: Tom Lane
Discussion: https://postgr.es/m/28209.1556556696@sss.pgh.pa.us

diff --git a/doc/src/sgml/release-12.sgml b/doc/src/sgml/release-12.sgml
index 5777eea2621b5575fe80852759c277a3894bddda..622770a5200bbf526d48e3f66082bb948272ac2f 100644 (file)
--- a/doc/src/sgml/release-12.sgml
+++ b/doc/src/sgml/release-12.sgml
@@ -2012,17 +2012,6 @@ Allow the XML BY VALUE clause (Chapman Flack)
 
 The clause has no effect.
 
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-Mark pg_config() stable rather than immutable (Joe Conway)
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