docs/zh_CN: redirect coding-sytle to Chinese version

It's time to link the doc into Chinese version.

Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Harry Wei <harryxiyou@gmail.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Federico Vaga <federico.vaga@vaga.pv.it>
Cc: SeongJae Park <sj38.park@gmail.com>
Cc: Tom Levy <tomlevy93@gmail.com>
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>