only WorkflowActivity, no CompensatableWorkflowActivity

Signed-off-by: Sky Ao <[email protected]>

0011-S-Saga-pattern-support-in-dapr-workflow.md

@@ -546,10 +546,10 @@ The customer must write a corresponding compensation activity for each activity
 
 ```java
 public class ProcessPaymentActivity implements WorkflowActivity {......}
-public class ProcessPaymentCompensationActivity implements CompensatableWorkflowActivity {......}
+public class ProcessPaymentCompensationActivity implements WorkflowActivity {......}
 
 public class UpdateInventoryActivity implements WorkflowActivity {......}
-public class UpdateInventoryCompensationActivity implements CompensatableWorkflowActivity {......}
+public class UpdateInventoryCompensationActivity implements WorkflowActivity {......}
 ```
 
 These compensation activities should also be registered like normal activities: