SQL function lo_unlink is not documented

Michael Richards (michael(at)fastmail(dot)ca) reports a bug with a severity of 4
The lower the number the more severe it is.

Short Description
SQL function lo_unlink is not documented

Long Description
http://postgresql.readysetnet.com/users-lounge/docs/7.1/programmer/lo-funcs.html

Says:
There are two built-in registered functions, lo_import and lo_export which are convenient for use in SQL queries. Here is an example of their use

CREATE TABLE image (
name text,
raster oid
);

INSERT INTO image (name, raster)
VALUES ('beautiful image', lo_import('/etc/motd'));

SELECT lo_export(image.raster, '/tmp/motd') from image
WHERE name = 'beautiful image';

This should also document the lo_unlink function as being able to remove these BLOBs is also supported. See below.

Sample Code
urdr=# select lo_unlink(6816289);
lo_unlink
-----------
1
(1 row)

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