Targeted preemption latency and minimal preemption granularity
for CPU-bound tasks have been changed.

This patch updates the comments about these values.
Signed-off-by: NTakuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <20101014160913.eb24fef4.yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: NIngo Molnar <mingo@elte.hu>