Documentation generation warns:

  Documentation/translations/zh_CN/admin-guide/cpu-load.rst:1:
  WARNING: Title overline too short.

Extend title heading markup by one. It was just off by one.

Fixes: e210c66d ("doc/zh_CN: add cpu-load Chinese version")
Signed-off-by: NLukas Bulwahn <lukas.bulwahn@gmail.com>
Acked-by: NTao Zhou <ouwen210@hotmail.com>
Link: https://lore.kernel.org/r/20200802162101.18875-1-lukas.bulwahn@gmail.comSigned-off-by: NJonathan Corbet <corbet@lwn.net>