docs/zh_CN: link management-style into process/index

Now we could find it's link after 'make htmldocs' etc.
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

@@ -42,6 +42,7 @@
    submit-checklist
    stable-api-nonsense
    stable-kernel-rules
+   management-style
 
 这些是一些总体技术指南，由于缺乏更好的地方，现在已经放在这里