add_active_range() has been repalced by memblock_set_node().  Clean up the
comments to comply with that change.
Signed-off-by: NZhang Zhen <zhenzhang.zhang@huawei.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>