docs/memory-barriers.txt/kokr: smp_mb__{before,after}_atomic(): update Documentation

Translate this commit to Korean:

  39323c64 ("smp_mb__{before,after}_atomic(): update Documentation")

Signed-off-by: SeongJae Park <sjpark@amazon.de>
Reviewed-by: Yunjae Lee <lyj7694@gmail.com>
Link: https://lore.kernel.org/r/20200606083746.20869-1-sjpark@amazon.de


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