Fix wrong cpuio option name in documentation
The name of an option for cpuio engine is "cpuchunks",
though the code internally uses "cpucycle" for variables.
(If the option name "cpuchunks" is the incorrect one,
I'll resubmit a patch that corrects the option name)
# fio --enghelp=cpuio
cpuload : Use this percentage of CPU
cpuchunks : Length of the CPU burn cycles (usecs)
exit_on_io_done : Exit when IO threads finish
Signed-off-by: Tomohiro Kusumi <kusumi.tomohiro@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>