Rename values of isolation level

docs/design/2021-04-26-lock-view.md

@@ -42,7 +42,7 @@ Several tables will be provided in `information_schema`. Some tables has both lo
 | `STATE`| `enum('Running', 'Lock waiting', 'Committing', 'RollingBack')`| The state of the transaction |
 | `WAITING_START_TIME` | `time` | The elapsed time since the start of the current lock waiting (if any) |
 | `SCOPE` | `enum('Global', 'Local')` | The scope of the transaction |
-| `ISOLATION_LEVEL` | `enum('RR', 'RC')` | |
+| `ISOLATION_LEVEL` | `enum('REPEATABLE-READ', 'READ-COMMITTED')` | |
 | `AUTOCOMMIT` | `bool` |  |
 | `SESSION_ID` | `unsigned bigint` | | 
 | `USER` | `varchar` | |