Thread: pgsql: Document long names for format options (plain, tar, custom).

Log Message:
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Document long names for format options (plain, tar, custom).  They already
worked and someone asked about them, so we might as well document them.

Modified Files:
--------------
    pgsql/doc/src/sgml/ref:
        pg_dump.sgml (r1.81 -> r1.82)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/pg_dump.sgml.diff?r1=1.81&r2=1.82)
        pg_restore.sgml (r1.58 -> r1.59)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/pg_restore.sgml.diff?r1=1.58&r2=1.59)