mm: hugetlb: remove left over comment about follow_huge_foo()

mm: hugetlb: remove left over comment about follow_huge_foo()

The comment is useless after commit 57a196a58421 ("hugetlb: simplify
hugetlb handling in follow_page_mask") since all follow_huge_foo() are
killed.

Link: https://lkml.kernel.org/r/20240725021643.1358536-1-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>