pgsql: Fix typo: pg_statistics -> pg_statistic

Fix typo: pg_statistics -> pg_statistic

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/5a366b4ff4ceceb9793fcc13c3f097ee0d32c56d

Modified Files
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doc/src/sgml/planstats.sgml | 2 +-
doc/src/sgml/release-7.4.sgml | 2 +-
doc/src/sgml/release-old.sgml | 4 ++--
src/backend/postmaster/autovacuum.c | 2 +-
src/backend/utils/cache/lsyscache.c | 2 +-
5 files changed, 6 insertions(+), 6 deletions(-)

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