doc: bgw_main takes a Datum argument, not void *.

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 9b4bd35aa1f185b3ad5b2e3d51a524f5bb77f577
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2014-02-27T14:41:43Z
Releases: 9.3.4
doc: bgw_main takes a Datum argument, not void *.

Per report from James Harper.

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doc/src/sgml/bgworker.sgml modified +2 −2