docs/zh_CN: fix rst format errors in howto.rst
Tame howto.rst file to avoid "ERROR: Unexpected indentation." etc compiler errors. 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: TripleX Chung <xxx.phy@gmail.com> Signed-off-by: Weiwei Jia <harryxiyou@gmail.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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