Merge missing content to man page

We missed the two CPU engine private options.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/fio.1 b/fio.1
index d197f7a..eddc265 100644
--- a/fio.1
+++ b/fio.1
@@ -1170,6 +1170,12 @@
 used identically to normal parameters, with the caveat that when used on the
 command line, the must come after the ioengine that defines them is selected.
 .TP
+.BI (cpu)cpuload \fR=\fPint
+Attempt to use the specified percentage of CPU cycles.
+.TP
+.BI (cpu)cpuchunks \fR=\fPint
+Split the load into cycles of the given time. In microseconds.
+.TP
 .BI (libaio)userspace_reap
 Normally, with the libaio engine in use, fio will use
 the io_getevents system call to reap newly returned events.