Type fix on stable_api_nonsense.txt

This patch fixes some minor typos in Documentation/ko_KR/stable_api_nonsense.txt

Signed-off-by: Lee, Jae-Hong <pyrasis@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>