pgsql: Fix a couple of typos

Fix a couple of typos

Noted by Peter Geoghegan

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/54aa5ef7f2dbe979843daf0c7a0d98f6709da4e6

Modified Files
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doc/src/sgml/pgstatstatements.sgml | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

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