Non-existent cs_log function

It's been pointed out that on the pl/pgsql control structures page
(http://www.postgresql.org/docs/9.0/interactive/plpgsql-control-structures.html)
there's an example using a cs_log function, which doesn't exist.  I'm
assuming this is supposed to be an example of a custom logging
function someone might have, but it might cause less confusion if
these were changed to RAISE calls, or something else that exists.

What do you think?

--
Thom Brown
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