[PATCH] add missing "USING bloom" into bloom extension documentation

In current bloom documentation an example

CREATE INDEX bloomidx ON tbloom(i1,i2,i3)
       WITH (length=5, col1=2, col2=2, col3=4);

does not work, as it does not actually create a bloom index

you should add "USING bloom" to the insert statement, in order make this
example work.

Patch in the attachment fixes an example. Please commit it ;-)

--
Nikolay Shaplov
Postgres Professional: http://www.postgrespro.com
Russian Postgres Company