Thread: pgsql: Fix missing parentheses for current_query(), per bug #5378.

Log Message:
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Fix missing parentheses for current_query(), per bug #5378.
Also make a couple other minor editorial improvements.

Modified Files:
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    pgsql/doc/src/sgml:
        func.sgml (r1.509 -> r1.510)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml?r1=1.509&r2=1.510)