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

update to commit 9d0f5cd1 ("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.cnSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/translations/zh_CN/process/index.rst

@@ -10,6 +10,7 @@
 
 .. _cn_process_index:
 
+========================
 与Linux 内核社区一起工作
 ========================