fix #1200: update doc

Author: jeromevdl

docs/utilities/idempotency.md

@@ -708,10 +708,12 @@ By using **`withPayloadValidationJMESPath("amount")`**, we prevent this potentia
 
 ### Making idempotency key required
 
-If you want to enforce that an idempotency key is required, you can set **`ThrowOnNoIdempotencyKey`** to `True`.
+If you want to enforce that an idempotency key is required, you can set **`ThrowOnNoIdempotencyKey`** to `true`.
 
 This means that we will throw **`IdempotencyKeyException`** if the evaluation of **`EventKeyJMESPath`** is `null`.
 
+When set to `false` (the default), if the idempotency key is null, then the data is not persisted in the store.
+
 === "App.java"
 
     ```java hl_lines="9-10 13"