BUG #13896: Current docs says 'worker_spi' is a contrib

The following bug has been logged on the website:

Bug reference: 13896
Logged by: Dickson S. Guedes
Email address: listas(at)guedesoft(dot)net
PostgreSQL version: 9.5.0
Operating system: All
Description:

>From docs [1]:

"The worker_spi contrib module contains a working example, which
demonstrates some useful techniques."

But, since commit 22dfd116a127a2fc916a4fdac282ee69d4905a25, 'worker_spi' is
no longer a contrib
module [1], and was moved to test modules, so I think that line could be
removed from docs or point
to new place.

[1] http://www.postgresql.org/docs/current/static/bgworker.html
[2] http://www.postgresql.org/docs/current/static/contrib.html

--
Dickson S. Guedes
mail/xmpp: guedes(at)guedesoft(dot)net - skype: guediz
http://github.com/guedes - http://guedesoft.net
http://www.postgresql.org.br