mm/vmscan: remove obsolete comment in kswapd_run

Since commit 6b700b5b ("mm/vmscan.c: remove cpu online notification
for now"), cpu online notification is removed.  So kswapd won't move to
proper cpus if cpus are hot-added.  Remove this obsolete comment.

Link: https://lkml.kernel.org/r/20220425111232.23182-6-linmiaohe@huawei.com


Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Huang, Ying <ying.huang@intel.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>