pgsql: Move pg_stat_statements into its on 9.4 release note section

Move pg_stat_statements into its on 9.4 release note section

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/a1c287a3836ff47e7ea01c82aceba75f15ba7c91

Modified Files
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doc/src/sgml/release-9.4.sgml | 76 ++++++++++++++++++++++-------------------
1 file changed, 41 insertions(+), 35 deletions(-)

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