docs/zh_CN: rename HOWTO into process directory

Make it available in htmldocs

Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Harry Wei <harryxiyou@gmail.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Li Yang <leoyang.li@nxp.com>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Coly Li <colyli@suse.de>
Signed-off-by: Weiwei Jia <harryxiyou@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

diff --git a/Documentation/translations/zh_CN/process/HOWTO b/Documentation/translations/zh_CN/process/howto.rst
similarity index 100%
rename from Documentation/translations/zh_CN/process/HOWTO
rename to Documentation/translations/zh_CN/process/howto.rst