Update Japanese README so that it reflects the changes made to the

Tatsuo Ishii <ishii@postgresql.org>

Commit: 4c0bdd1ba81530769c952c6113393350ee71558f
Author: Tatsuo Ishii <ishii@postgresql.org>
Date: 2002-09-18T01:21:28Z
Releases: 7.3.1
Update Japanese README so that it reflects the changes made to the
conversion function interface.

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