docs/memory-barriers.txt/kokr: introduce io_stop_wc() and add implementation for ARM64

Translate this commit to Korean:

    d5624bb2 ("asm-generic: introduce io_stop_wc() and add implementation for ARM64")

Signed-off-by: SeongJae Park <sj@kernel.org>
Reviewed-by: Yunjae Lee <lyj7694@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>