mm/page_alloc: reword the comment of buddy_merge_likely()

mm/page_alloc: reword the comment of buddy_merge_likely()

For page with order O, we are checking its order (O + 1)'s buddy.  If it
is free, we would like to put it to the tail and expect it would be merged
to a page with order (O + 2).

Reword the comment to reflect it.

Link: https://lkml.kernel.org/r/20240619010612.20740-4-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>