Doc: update URL for check_postgres.
Reported by Dan Vianello.
Discussion: https://postgr.es/m/e6e12f18f70e46848c058084d42fb651@KSTLMEXGP001.CORP.CHARTERCOM.com
Branch------REL_10_STABLE
Details-------https://git.postgresql.org/pg/commitdiff/1048afc864e84b4f206bb7edd3773b49f1d8cc5b
Modified Files--------------doc/src/sgml/maintenance.sgml | 4 ++--1 file changed, 2 insertions(+), 2 deletions(-)