Missing date_trunc docs

In table 9-27 of the 9.2 docs:

    http://www.postgresql.org/docs/9.2/interactive/functions-datetime.html#FUNCTIONS-DATETIME-TABLE

There is an entry for date_trunc(text, timestamp) but no entry for date_trunc(text, interval). The full docs for
date_trunc:

    http://www.postgresql.org/docs/9.2/interactive/functions-datetime.html#FUNCTIONS-DATETIME-TRUNC

do mention both the timestamp and interval forms of date_trunc but that's easy to miss if you're just scanning the
functionlists. 

Eric Howe
eric@pieinsky.ca
http://pieinsky.ca/