fix comment issue

src/ray/gcs/gcs_server/gcs_placement_group_manager.cc

@@ -96,8 +96,8 @@ void GcsPlacementGroup::MarkCreatorActorDead() {
   placement_group_table_data_.set_creator_actor_dead(true);
 }
 
-bool GcsPlacementGroup::IsPlacementGroupRemovable() const {
-  return placement_group_table_data_.creator_job_dead() &&
+bool GcsPlacementGroup::IsPlacementGroupLifetimeDone() const {
+  return !IsDetached() && placement_group_table_data_.creator_job_dead() &&
          placement_group_table_data_.creator_actor_dead();
 }
 
@@ -497,7 +497,7 @@ void GcsPlacementGroupManager::CleanPlacementGroupIfNeededWhenJobDead(
       continue;
     }
     placement_group->MarkCreatorJobDead();
-    if (placement_group->IsPlacementGroupRemovable()) {
+    if (placement_group->IsPlacementGroupLifetimeDone()) {
       RemovePlacementGroup(placement_group->GetPlacementGroupID(), [](Status status) {});
     }
   }
@@ -511,7 +511,7 @@ void GcsPlacementGroupManager::CleanPlacementGroupIfNeededWhenActorDead(
       continue;
     }
     placement_group->MarkCreatorActorDead();
-    if (!placement_group->IsDetached() && placement_group->IsPlacementGroupRemovable()) {
+    if (placement_group->IsPlacementGroupLifetimeDone()) {
       RemovePlacementGroup(placement_group->GetPlacementGroupID(), [](Status status) {});
     }
   }

src/ray/gcs/gcs_server/gcs_placement_group_manager.h

@@ -108,8 +108,8 @@ class GcsPlacementGroup {
   /// Mark that the creator actor of this placement group is dead.
   void MarkCreatorActorDead();
 
-  /// Return True if the placement group is removable. False otherwise.
-  bool IsPlacementGroupRemovable() const;
+  /// Return True if the placement group lifetime is done. False otherwise.
+  bool IsPlacementGroupLifetimeDone() const;
 
   /// Returns whether or not this is a detached placement group.
   bool IsDetached() const;