docs/memory-barriers.txt/kokr: Allow architecture to override the flush barrier

Translate this commit to Korean:

    3e79f082

 ("libnvdimm/nvdimm/flush: Allow architecture to override the flush barrier")

Signed-off-by: SeongJae Park <sjpark@amazon.de>
Reviewed-by: Yunjae Lee <lyj7694@gmail.com>
Link: https://lore.kernel.org/r/20200829084027.4591-1-sj38.park@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>