fix apparent typo in release notes
Branch
------
REL_18_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/7c3a036f5c6d05657f5e9bd081a7dfcfb3c49639
Modified Files
--------------
doc/src/sgml/release-18.sgml | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)