Add missing @since tag

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/data/web/SpringDataWebAutoConfiguration.java

@@ -33,6 +33,7 @@ import org.springframework.data.web.config.EnableSpringDataWebSupport;
  * support through the {@link EnableSpringDataWebSupport} annotation.
  *
  * @author Andy Wilkinson
+ * @since 1.2.0
  */
 @Configuration
 @EnableSpringDataWebSupport