Update MockMvc section on Streaming in the docs

Closes gh-32687

Author: rstoyanchev

framework-docs/modules/ROOT/pages/testing/spring-mvc-test-framework/vs-end-to-end-integration-tests.adoc

@@ -1,7 +1,7 @@
 [[spring-mvc-test-vs-end-to-end-integration-tests]]
 = MockMvc vs End-to-End Tests
 
-MockMVc is built on Servlet API mock implementations from the
+MockMvc is built on Servlet API mock implementations from the
 `spring-test` module and does not rely on a running container. Therefore, there are
 some differences when compared to full end-to-end integration tests with an actual
 client and a live server running.

framework-docs/modules/ROOT/pages/testing/spring-mvc-test-framework/vs-streaming-response.adoc

@@ -1,38 +1,15 @@
 [[spring-mvc-test-vs-streaming-response]]
 = Streaming Responses
 
-The best way to test streaming responses such as Server-Sent Events is through the
-<<WebTestClient>> which can be used as a test client to connect to a `MockMvc` instance
-to perform tests on Spring MVC controllers without a running server. For example:
-
-[tabs]
-======
-Java::
-+
-[source,java,indent=0,subs="verbatim,quotes",role="primary"]
-----
-	WebTestClient client = MockMvcWebTestClient.bindToController(new SseController()).build();
-
-	FluxExchangeResult<Person> exchangeResult = client.get()
-			.uri("/persons")
-			.exchange()
-			.expectStatus().isOk()
-			.expectHeader().contentType("text/event-stream")
-			.returnResult(Person.class);
-
-	// Use StepVerifier from Project Reactor to test the streaming response
-
-	StepVerifier.create(exchangeResult.getResponseBody())
-			.expectNext(new Person("N0"), new Person("N1"), new Person("N2"))
-			.expectNextCount(4)
-			.consumeNextWith(person -> assertThat(person.getName()).endsWith("7"))
-			.thenCancel()
-			.verify();
-----
-======
-
-`WebTestClient` can also connect to a live server and perform full end-to-end integration
-tests. This is also supported in Spring Boot where you can
-{docs-spring-boot}/html/spring-boot-features.html#boot-features-testing-spring-boot-applications-testing-with-running-server[test a running server].
-
+You can use `WebTestClient` to test xref:testing/webtestclient.adoc#webtestclient-stream[streaming responses]
+such as Server-Sent Events. However, `MockMvcWebTestClient` doesn't support infinite
+streams because there is no way to cancel the server stream from the client side.
+To test infinite streams, you'll need to
+xref:testing/webtestclient.adoc#webtestclient-server-config[bind to] a running server,
+or when using Spring Boot,
+{docs-spring-boot}/spring-boot-features.html#boot-features-testing-spring-boot-applications-testing-with-running-server[test with a running server].
+
+`MockMvcWebTestClient` does support asynchronous responses, and even streaming responses.
+The limitation is that it can't influence the server to stop, and therefore the server
+must finish writing the response on its own.