Improve a couple of 9.2 release note entries.

Clarify the compatibility notes about EXTRACT() and about statistics
timing columns.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/7417a8e3dd14886887447053a5ccbd4f9501ba61

Modified Files
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doc/src/sgml/release-9.2.sgml |   37 ++++++++++++++++++++++---------------
1 files changed, 22 insertions(+), 15 deletions(-)

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