pgsql: Add an example showing how to cope with mixed-case names in

Log Message:
-----------
Add an example showing how to cope with mixed-case names in pg_dump
switches.

Modified Files:
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pgsql/doc/src/sgml/ref:
pg_dump.sgml (r1.91 -> r1.92)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/pg_dump.sgml.diff?r1=1.91&r2=1.92)