Fix HeapTupleSatisfiesNonVacuumable() comment.
Oversight in commit
@@ -1389,7 +1389,7 @@ HeapTupleSatisfiesVacuum(HeapTuple htup, TransactionId OldestXmin,
* True if tuple might be visible to some transaction; false if it's
* surely dead to everyone, ie, vacuumable.
*
- * See SNAPSHOT_TOAST's definition for the intended behaviour.
+ * See SNAPSHOT_NON_VACUUMABLE's definition for the intended behaviour.
*
* This is an interface to HeapTupleSatisfiesVacuum that's callable via
* HeapTupleSatisfiesSnapshot, so it can be used through a Snapshot.
