docs/zh_CN: promote the title of zh_CN/process/index.rst

docs/zh_CN: promote the title of zh_CN/process/index.rst

update to commit 9d0f5cd16744 ("docs: promote the title of
process/index.rst")

Signed-off-by: Wu XiangCheng <bobwxc@email.cn>
Reviewed-by: Yanteng Si <siyanteng@loongson.cn>
Link: https://lore.kernel.org/r/2741340f3b5f131a32d0f295224edd569aab0d98.1665467392.git.bobwxc@email.cn
Signed-off-by: Jonathan Corbet <corbet@lwn.net>