Correct typos in perf bench & perf sched help text.
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>, Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <20100331113100.cc898487.randy.dunlap@oracle.com> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>