mm/memory_hotplug: fix kerneldoc comment for __remove_memory

make W=1 generates the following warning for __remove_memory

  mm/memory_hotplug.c:2044: warning: expecting prototype for remove_memory(). Prototype was for __remove_memory() instead

Commit eca499ab ("mm/hotplug: make remove_memory() interface usable")
introduced the kerneldoc comment and function but the kerneldoc name and
function name did not match.

Link: https://lkml.kernel.org/r/20210520084809.8576-9-mgorman@techsingularity.net
Fixes: eca499ab

 ("mm/hotplug: make remove_memory() interface usable")
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>