doc: split long query into multiple lines

Bruce Momjian <bruce@momjian.us>

Commit: 5043fc8251fa272177c69b86a8df2cb79d926521
Author: Bruce Momjian <bruce@momjian.us>
Date: 2013-12-04T15:03:13Z
Releases: 9.4.0
doc: split long query into multiple lines

Report from Erik Rijkers

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doc/src/sgml/advanced.sgml modified +3 −1