Fix Javadoc of SpringBatchTest annotation

fix double @-symbol in javadoc

Issue #4102

spring-batch-test/src/main/java/org/springframework/batch/test/context/SpringBatchTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018-2020 the original author or authors.
+ * Copyright 2018-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -56,10 +56,10 @@ import org.springframework.test.context.junit.jupiter.SpringExtension;
  * @ContextConfiguration(classes = MyBatchJobConfiguration.class)
  * public class MyBatchJobTests {
  *
- *    @@Autowired
+ *    @Autowired
  *    private JobLauncherTestUtils jobLauncherTestUtils;
  *
- *    @@Autowired
+ *    @Autowired
  *    private JobRepositoryTestUtils jobRepositoryTestUtils;
  *
  *    @Before
@@ -91,10 +91,10 @@ import org.springframework.test.context.junit.jupiter.SpringExtension;
  * @ContextConfiguration(classes = MyBatchJobConfiguration.class)
  * public class MyBatchJobTests {
  *
- *    @@Autowired
+ *    @Autowired
  *    private JobLauncherTestUtils jobLauncherTestUtils;
  *
- *    @@Autowired
+ *    @Autowired
  *    private JobRepositoryTestUtils jobRepositoryTestUtils;
  *
  *    @BeforeEach