pr: typo, and use purge_old_bank_snapshots()

ledger/src/bank_forks_utils.rs

@@ -339,12 +339,12 @@ fn bank_forks_from_snapshot(
         })?;
 
         // If the node crashes before taking the next bank snapshot, the next startup will attempt
-        // to load from the same bank snapshot again. And if `shrink` has run, the account storage
+        // to load from the same bank snapshot again.  And if `shrink` has run, the account storage
         // files that are hard linked in bank snapshot will be *different* than what the bank
-        // snapshot exists.  This would cause the node to crash again.  To prevent that, purge all
+        // snapshot expects.  This would cause the node to crash again.  To prevent that, purge all
         // the bank snapshots here.  In the above scenario, this will cause the node to load from a
         // snapshot archive next time, which is safe.
-        snapshot_utils::purge_all_bank_snapshots(&snapshot_config.bank_snapshots_dir);
+        snapshot_utils::purge_old_bank_snapshots(&snapshot_config.bank_snapshots_dir, 0, None);
 
         bank
     };