Aggregate ORDER BY docs patch, first attempt

Andrew Gierth <andrew@tao11.riddles.org.uk>

From: Andrew Gierth <andrew@tao11.riddles.org.uk>
To: pgsql-hackers@postgresql.org
Date: 2009-11-13T23:49:11Z
Lists: pgsql-hackers

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First attempt at a docs patch for aggregate order by.

-- 
Andrew.