pgsql: Doc: update URL for check_postgres.

Doc: update URL for check_postgres.

Reported by Dan Vianello.

Discussion: /messages/by-id/e6e12f18f70e46848c058084d42fb651@KSTLMEXGP001.CORP.CHARTERCOM.com

Branch
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REL9_3_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/e89867c033291b01614cb1a0e6fe76ce4c478ea6

Modified Files
--------------
doc/src/sgml/maintenance.sgml | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

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