Document why you can't use date_trunc("week") on intervals.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/74f4881d7cc9c69cb0e0b236f06d1ebf9859a737

Modified Files
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doc/src/sgml/func.sgml |    5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)

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Next:	From: Bruce Momjian	Date: 2012-08-15 20:48:17
	Subject: pgsql: On second thought,explain why date_trunc("week") on interval va
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	Subject: pgsql: Add C comment that '=' is not documented for plpgsqlassignment.