AbpSystemTextJsonSerializerOptions description added.

docs/en/JSON.md

@@ -40,6 +40,8 @@ public class ProductManager
 
 ## Configuration
 
+### AbpJsonOptions
+
 `AbpJsonOptions` type provides options for the JSON operations in the ABP Framework.
 
 Properties:
@@ -47,3 +49,12 @@ Properties:
 * **UseHybridSerializer(`bool`)**: True by default. Boolean field indicating whether the ABP Framework uses the hybrid approach or not. If the field is true, it will try to use `System.Json.Text` to handle JSON if it can otherwise use the `Newtonsoft.Json.`
 * **Providers(`ITypeList<IJsonSerializerProvider>`)**: List of JSON serializer providers implementing the `IJsonSerializerProvider` interface. You can create and add custom serializers to the list, and the ABP Framework uses them automatically. When the `Serialize` or `Deserialize` method is called on the `IJsonSerializer` interface, the ABP Framework calls the `CanHandle` methods of the given providers in reverse order and uses the first provider that returns `true` to do the JSON operation.
 
+### AbpSystemTextJsonSerializerOptions
+
+`AbpSystemTextJsonSerializerOptions` provides options for  `System.Text.Json` usage. 
+
+Properties:
+
+- **JsonSerializerOptions(`System.Text.Json.JsonSerializerOptions`)**: Global options for System.Text.Json library operations. See [here](https://docs.microsoft.com/en-us/dotnet/api/system.text.json.jsonserializeroptions) for reference.
+- **UnsupportedTypes(`ITypeList`)**: List of the unsupported types. You can add types of the unsupported types to the list and, the hybrid JSON serializer automatically uses the `Newtonsoft.Json` library instead of `System.Text.Json`.
+