f2fs: Update the default value of the documentation ckpt_thread_ioprio
The commit 8a2d9f00d has been updated to set its default value to "rt,3",
fixing the outdated default value in the F2FS documentation.
Signed-off-by: ZhaoYueNan <amktiao030215@gmail.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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