Documentation: f2fs: fix typo s/automaic/automatic

Fix typo in f2fs documentation.

Signed-off-by: Ed Tsai <ed.tsai@mediatek.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
1 file changed