pgsql: Improve documentation of EXTRACT(WEEK).

Improve documentation of EXTRACT(WEEK).

The docs showed that early-January dates can be considered part of the
previous year for week-counting purposes, but failed to say explicitly
that late-December dates can also be considered part of the next year.
Fix that, and add a cross-reference to the "isoyear" field. Per bug
#7967 from Pawel Kobylak.

Branch
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REL8_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/8c54115cbbd9e49d75d477be41bd632721b9406d

Modified Files
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doc/src/sgml/func.sgml | 19 +++++++++++--------
1 files changed, 11 insertions(+), 8 deletions(-)

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