Fix another batch of spelling typos (#13915)

* Fix typos

* Remove repeated words

* Minor grammar fixes

samples/client/petstore/java/webclient-nullable-arrays/docs/ByteArrayObject.md

@@ -0,0 +1,17 @@
+
+
+# ByteArrayObject
+
+
+## Properties
+
+| Name | Type | Description | Notes |
+|------------ | ------------- | ------------- | -------------|
+|**nullableArray** | **byte[]** | byte array. |  [optional] |
+|**normalArray** | **byte[]** | byte array. |  [optional] |
+|**nullableString** | **String** |  |  [optional] |
+|**stringField** | **String** |  |  [optional] |
+|**intField** | **BigDecimal** |  |  [optional] |
+
+
+

samples/client/petstore/java/webclient-nullable-arrays/docs/DefaultApi.md

@@ -0,0 +1,71 @@
+# DefaultApi
+
+All URIs are relative to *http://localhost*
+
+| Method | HTTP request | Description |
+|------------- | ------------- | -------------|
+| [**nullableArrayTestGet**](DefaultApi.md#nullableArrayTestGet) | **GET** /nullable-array-test |  |
+
+
+
+## nullableArrayTestGet
+
+> List<ByteArrayObject> nullableArrayTestGet()
+
+
+
+
+
+### Example
+
+```java
+// Import classes:
+import org.openapitools.client.ApiClient;
+import org.openapitools.client.ApiException;
+import org.openapitools.client.Configuration;
+import org.openapitools.client.models.*;
+import org.openapitools.client.api.DefaultApi;
+
+public class Example {
+    public static void main(String[] args) {
+        ApiClient defaultClient = Configuration.getDefaultApiClient();
+        defaultClient.setBasePath("http://localhost");
+
+        DefaultApi apiInstance = new DefaultApi(defaultClient);
+        try {
+            List<ByteArrayObject> result = apiInstance.nullableArrayTestGet();
+            System.out.println(result);
+        } catch (ApiException e) {
+            System.err.println("Exception when calling DefaultApi#nullableArrayTestGet");
+            System.err.println("Status code: " + e.getCode());
+            System.err.println("Reason: " + e.getResponseBody());
+            System.err.println("Response headers: " + e.getResponseHeaders());
+            e.printStackTrace();
+        }
+    }
+}
+```
+
+### Parameters
+
+This endpoint does not need any parameter.
+
+### Return type
+
+[**List&lt;ByteArrayObject&gt;**](ByteArrayObject.md)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: application/json
+
+
+### HTTP response details
+| Status code | Description | Response headers |
+|-------------|-------------|------------------|
+| **200** |  |  -  |
+