Polish "Align TestRestTemplate Javadoc with documentation"

See gh-21318

spring-boot-project/spring-boot-test/src/main/java/org/springframework/boot/test/web/client/TestRestTemplate.java

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
@@ -66,13 +66,9 @@ import org.springframework.web.util.UriTemplateHandler;
  * <p>
  * If you are using the
  * {@link org.springframework.boot.test.context.SpringBootTest @SpringBootTest} annotation
- * with
- * {@link org.springframework.boot.test.context.SpringBootTest.WebEnvironment#RANDOM_PORT
- * WebEnvironment.RANDOM_PORT} or
- * {@link org.springframework.boot.test.context.SpringBootTest.WebEnvironment#DEFINED_PORT
- * WebEnvironment.DEFINED_PORT}, a {@link TestRestTemplate} is automatically available and
- * can be {@code @Autowired} into your test. If you need customizations (for example to
- * adding additional message converters) use a {@link RestTemplateBuilder} {@code @Bean}.
+ * with an embedded server, a {@link TestRestTemplate} is automatically available and can
+ * be {@code @Autowired} into your test. If you need customizations (for example to adding
+ * additional message converters) use a {@link RestTemplateBuilder} {@code @Bean}.
  *
  * @author Dave Syer
  * @author Phillip Webb