Thread: pgsql: Clarify plpgsql documentation by not treating IF THEN ELSE IF ...

Log Message:
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Clarify plpgsql documentation by not treating IF THEN ELSE IF ... as a
truly distinct version of IF.  Per suggestion from Marko Kreen.

Modified Files:
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    pgsql/doc/src/sgml:
        plpgsql.sgml (r1.130 -> r1.131)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/plpgsql.sgml?r1=1.130&r2=1.131)