mm: swap: remove scan_swap_map_slots() references from comments

mm: swap: remove scan_swap_map_slots() references from comments

The scan_swap_map_slots() helper has been removed, but several comments
still referred to it in swap allocation and reclaim paths.  This patch
cleans up those outdated references and reflows the affected comment
blocks to match kernel coding style.

Link: https://lkml.kernel.org/r/20251031065011.40863-6-youngjun.park@lge.com
Signed-off-by: Youngjun Park <youngjun.park@lge.com>
Reviewed-by: Baoquan He <bhe@redhat.com>
Acked-by: Chris Li <chrisl@kernel.org>
Cc: Barry Song <baohua@kernel.org>
Cc: Kairui Song <kasong@tencent.com>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>