sched: Fix leftover comment typos

mainline inclusion
from mainline-v5.14-rc1
commit cc00c198
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5OOWG
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cc00c1988801dc71f63bb7bad019e85046865095



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A few more snuck in. Also capitalize 'CPU' while at it.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Lin Shengwang <linshengwang1@huawei.com>
Reviewed-by: lihua <hucool.lihua@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>