docs/ja_JP: fix typos and duplicated phrases in kernel development guide

Fix obvious typos and duplicated phrases in the Japanese translation.

No change in meaning intended.

Acked-by: Akira Yokosawa <akiyks@gmail.com>
Signed-off-by: Masaharu Noguchi <nogunix@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20260104-ja-howto-v2-1-8cac525b3dfe@gmail.com>
This commit is contained in:
Masaharu Noguchi 2026-01-04 20:58:40 +09:00 • committed by Jonathan Corbet
commit b09ee709a9