MAINTAINERS: Add entry for DOCUMENTATION/JAPANESE

Due to the lack of an entry for the Japanese translation of
documentation, Kosuke Fujimoto needed to ask the status of
its maintenance [1].

Add an entry for DOCUMENTATION/JAPANESE as a sub-subsystem
under the DOCUMENTATION subsystem to make it easier for
another prospective contributor to know there is someone
who takes care of Japanese translation.

As a first step, install myself as a designated reviewer.
Hopefully, other interested members get accustomed to the
kernel-dev workflow and would get ready to be
(co-)maintainers/reviewers shortly.

[1]: https://lore.kernel.org/r/[email protected]/

Signed-off-by: Akira Yokosawa <[email protected]>
Cc: Jonathan Corbet  <[email protected]>
Cc: Tsugikazu Shibata <[email protected]>
Cc: Kosuke Fujimoto <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Corbet <[email protected]>

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