pgsql: Add date_trunc('', interval) documentation mention

Add date_trunc('', interval) documentation mention

Report from Eric Howe

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/90afc7d805657f6913935913a5bbd2462da80388

Modified Files
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doc/src/sgml/func.sgml | 14 ++++++++++++++
1 file changed, 14 insertions(+)

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