Improve extract(day) documentation with interval values.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/cbd2811461daf2c6b71d56048b96374cc2d61d64

Modified Files
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doc/src/sgml/func.sgml |   11 +++++++++--
1 files changed, 9 insertions(+), 2 deletions(-)

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