BUG #7824: documentation bug: Extract DOW

The following bug has been logged on the website:

Bug reference:      7824
Logged by:          Tim Romano
Email address:      tim.romano@yahoo.com
PostgreSQL version: 9.2.2
Operating system:   Windows 7 x64
Description:        =


Documentation seems to indicate that only a Timestamp value is a valid
argument to the Extract function when trying to get the DOW, but a Date also
works:

dow =

The day of the week (0 - 6; Sunday is 0) (for timestamp values only)

SELECT EXTRACT(DOW FROM TIMESTAMP '2001-02-16 20:38:40'); Result: 5