docs/zh_CN: link CoC interpretation into index

So people could be easy to find it.
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Harry Wei <harryxiyou@gmail.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/translations/zh_CN/process/index.rst

@@ -24,6 +24,7 @@
 
    howto
    code-of-conduct
+   code-of-conduct-interpretation
    submitting-patches
    coding-style
    development-process