pgsql: Fix typo

Fix typo

Branch
------
REL9_5_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/af017fc195fbf7e861cef470d5169320c45f5582

Modified Files
--------------
doc/src/sgml/ref/pg_basebackup.sgml | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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