mm/memcg: fix obsolete comment above MEM_CGROUP_MAX_RECLAIM_LOOPS

Since commit 5660048c ("mm: move memcg hierarchy reclaim to generic
reclaim code"), mem_cgroup_hierarchical_reclaim() is already renamed to
mem_cgroup_soft_reclaim().  Update the corresponding comment.

Link: https://lkml.kernel.org/r/20230713121432.273381-1-linmiaohe@huawei.comSigned-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/memcontrol.c

@@ -197,7 +197,7 @@ static struct move_charge_struct {
 };
 
 /*
- * Maximum loops in mem_cgroup_hierarchical_reclaim(), used for soft
+ * Maximum loops in mem_cgroup_soft_reclaim(), used for soft
  * limit reclaim to prevent infinite loops, if they ever occur.
  */
 #define	MEM_CGROUP_MAX_RECLAIM_LOOPS		100