Thread: pgsql: Remove mention that history is _now_ automatically saved on exit.

Log Message:
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Remove mention that history is _now_ automatically saved on exit.  It
has been that way for a long time.

Modified Files:
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    pgsql/doc/src/sgml/ref:
        psql-ref.sgml (r1.154 -> r1.155)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/psql-ref.sgml.diff?r1=1.154&r2=1.155)