Update documentation to reflect C# object usage

Signed-off-by: Henrique Graca <[email protected]>

Author: hjgraca

docs/utilities/idempotency.md

@@ -877,7 +877,7 @@ Idempotency.Config()
 
 ???+ info "Info: Using custom de-serialization?"
 
-    The response hook is called after de-serialization so the payload you process will be the de-serialized Java object.
+    The response hook is called after de-serialization so the payload you process will be the de-serialized C# object.
 
 #### Being a good citizen
 
@@ -965,4 +965,4 @@ When testing your code, you may wish to disable the idempotency logic altogether
 ## Extra resources
 
 If you're interested in a deep dive on how Amazon uses idempotency when building our APIs, check out
-[this article](https://aws.amazon.com/builders-library/making-retries-safe-with-idempotent-APIs/).
+[this article](https://aws.amazon.com/builders-library/making-retries-safe-with-idempotent-APIs/).