update c# petstore samples

samples/client/petstore/csharp/SwaggerClientWithPropertyChanged/docs/FakeApi.md

@@ -11,6 +11,7 @@ Method | HTTP request | Description
 [**TestClientModel**](FakeApi.md#testclientmodel) | **PATCH** /fake | To test \"client\" model
 [**TestEndpointParameters**](FakeApi.md#testendpointparameters) | **POST** /fake | Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 [**TestEnumParameters**](FakeApi.md#testenumparameters) | **GET** /fake | To test enum parameters
+[**TestJsonFormData**](FakeApi.md#testjsonformdata) | **GET** /fake/jsonFormData | test json serialization of form data
 
 
 <a name="fakeouterbooleanserialize"></a>
@@ -478,3 +479,65 @@ No authorization required
 
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
+<a name="testjsonformdata"></a>
+# **TestJsonFormData**
+> void TestJsonFormData (string param, string param2)
+
+test json serialization of form data
+
+
+
+### Example
+```csharp
+using System;
+using System.Diagnostics;
+using IO.Swagger.Api;
+using IO.Swagger.Client;
+using IO.Swagger.Model;
+
+namespace Example
+{
+    public class TestJsonFormDataExample
+    {
+        public void main()
+        {
+            var apiInstance = new FakeApi();
+            var param = param_example;  // string | field1
+            var param2 = param2_example;  // string | field2
+
+            try
+            {
+                // test json serialization of form data
+                apiInstance.TestJsonFormData(param, param2);
+            }
+            catch (Exception e)
+            {
+                Debug.Print("Exception when calling FakeApi.TestJsonFormData: " + e.Message );
+            }
+        }
+    }
+}
+```
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **param** | **string**| field1 | 
+ **param2** | **string**| field2 | 
+
+### Return type
+
+void (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: application/json
+ - **Accept**: Not defined
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+