docs: enhance custom request parameters section with version info and additional guidance

Author: crmne

docs/guides/chat.md

@@ -246,7 +246,11 @@ puts response2.content
 
 You can set the temperature using `with_temperature`, which returns the `Chat` instance for chaining.
 
-## Custom Request Parameters
+## Custom Request Parameters (`with_params`)
+{: .d-inline-block }
+
+Available in v1.4.0
+{: .label .label-yellow }
 
 You can configure additional provider-specific features by adding custom fields to each API request. Use the `with_params` method.
 
@@ -257,7 +261,7 @@ response = chat.ask "What is the square root of 64? Answer with a JSON object wi
 puts JSON.parse(response.content)
 ```
 
-Allowed parameters vary widely by provider and model.
+Allowed parameters vary widely by provider and model. Please consult the provider's documentation.
 
 ## Tracking Token Usage