docs/zh_CN: add a missing space character

"LinusTorvalds" is not pretty. Replace it with "Linus Torvalds".

Signed-off-by: Hu Haowen <src.res@email.cn>
Link: https://lore.kernel.org/r/20210620010444.24813-1-src.res@email.cn


Signed-off-by: Jonathan Corbet <corbet@lwn.net>