doc: improve USING and NATURAL JOIN descriptions

Bruce Momjian <bruce@momjian.us>

Commit: 032f3b7e166cfa2818b0a9572324e362bf8895df
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-10-13T19:39:52Z
Releases: 9.5.0
doc: improve USING and NATURAL JOIN descriptions

Patch by David G Johnston

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doc/src/sgml/queries.sgml modified +43 −14