Update samples for okhttp-gson.

samples/client/petstore/java/okhttp-gson/docs/FakeClassnameTags123Api.md

@@ -0,0 +1,52 @@
+# FakeClassnameTags123Api
+
+All URIs are relative to *http://petstore.swagger.io/v2*
+
+Method | HTTP request | Description
+------------- | ------------- | -------------
+[**testClassname**](FakeClassnameTags123Api.md#testClassname) | **PATCH** /fake_classname_test | To test class name in snake case
+
+
+<a name="testClassname"></a>
+# **testClassname**
+> Client testClassname(body)
+
+To test class name in snake case
+
+### Example
+```java
+// Import classes:
+//import io.swagger.client.ApiException;
+//import io.swagger.client.api.FakeClassnameTags123Api;
+
+
+FakeClassnameTags123Api apiInstance = new FakeClassnameTags123Api();
+Client body = new Client(); // Client | client model
+try {
+    Client result = apiInstance.testClassname(body);
+    System.out.println(result);
+} catch (ApiException e) {
+    System.err.println("Exception when calling FakeClassnameTags123Api#testClassname");
+    e.printStackTrace();
+}
+```
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **body** | [**Client**](Client.md)| client model |
+
+### Return type
+
+[**Client**](Client.md)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: application/json
+ - **Accept**: application/json
+