docs/zh_CN: redirect the submitting-patches to Chinese doc

docs/zh_CN: redirect the submitting-patches to Chinese doc

Now we have latest Chinese version submitting-patches.rst, it's time to
use it in other docs.

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: James Morris <james.morris@microsoft.com>
Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>