pgsql: Improve usage message for pgindent.
Log Message:
-----------
Improve usage message for pgindent.
Modified Files:
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pgsql/src/tools/pgindent:
pgindent (r1.97 -> r1.98)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/pgindent/pgindent?r1=1.97&r2=1.98)