Fix source code callouts in Reference Manual

src/docs/asciidoc/data-access-appendix.adoc

@@ -37,16 +37,19 @@ are available to you:
 ----
 	<?xml version="1.0" encoding="UTF-8"?>
 	<beans xmlns="http://www.springframework.org/schema/beans"
-			xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-			xmlns:aop="http://www.springframework.org/schema/aop"
-			xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation=" <1>
+		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+		xmlns:aop="http://www.springframework.org/schema/aop"
+		xmlns:tx="http://www.springframework.org/schema/tx" <1>
+		xsi:schemaLocation="
 			http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 			http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd <2>
-			http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <!-- bean definitions here -->
+			http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
+
+		<!-- bean definitions here -->
 
 	</beans>
 ----
-<1> Specify the namespace.
+<1> Declare usage of the `tx` namespace.
 <2> Specify the location (with other schema locations).
 ====
 
@@ -77,12 +80,15 @@ the correct schema so that the elements in the `jdbc` namespace are available to
 	<?xml version="1.0" encoding="UTF-8"?>
 	<beans xmlns="http://www.springframework.org/schema/beans"
 		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-		xmlns:jdbc="http://www.springframework.org/schema/jdbc" xsi:schemaLocation=" <2>
+		xmlns:jdbc="http://www.springframework.org/schema/jdbc" <1>
+		xsi:schemaLocation="
 			http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
-			http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd"> <!-- bean definitions here --> <2>
+			http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd"> <2>
+
+		<!-- bean definitions here -->
 
 	</beans>
 ----
-<1> Specify the namespace.
+<1> Declare usage of the `jdbc` namespace.
 <2> Specify the location (with other schema locations).
 ====

src/docs/asciidoc/testing.adoc

@@ -758,7 +758,7 @@ configuration scenarios:
 [source,java,indent=0]
 [subs="verbatim,quotes"]
 ----
-	@DirtiesContext
+	@DirtiesContext <1>
 	public class ContextDirtyingTests {
 		// some tests that result in the Spring container being dirtied
 	}

src/docs/asciidoc/web/webflux-webclient.adoc

@@ -208,16 +208,17 @@ The following example shows how to customize Jetty `HttpClient` settings:
 By default, `HttpClient` creates its own resources (`Executor`, `ByteBufferPool`, `Scheduler`),
 which remain active until the process exits or `stop()` is called.
 
-You can share resources between multiple instances of the Jetty client (and server) and ensure that the
-resources are shut down when the Spring `ApplicationContext` is closed by declaring a
-Spring-managed bean of type `JettyResourceFactory`, as the following example shows:
+You can share resources between multiple instances of the Jetty client (and server) and
+ensure that the resources are shut down when the Spring `ApplicationContext` is closed by
+declaring a Spring-managed bean of type `JettyResourceFactory`, as the following example
+shows:
 
 ====
 [source,java,intent=0]
 [subs="verbatim,quotes"]
 ----
 	@Bean
-	public JettyResourceFactory resourceFactory() {
+	public JettyResourceFactory resourceFactory() { <1>
 		return new JettyResourceFactory();
 	}
 
@@ -229,13 +230,13 @@ Spring-managed bean of type `JettyResourceFactory`, as the following example sho
 		};
 
 		ClientHttpConnector connector =
-				new JettyClientHttpConnector(resourceFactory(), customizer); // <2>
+				new JettyClientHttpConnector(resourceFactory(), customizer); <2>
 
-		return WebClient.builder().clientConnector(connector).build(); // <3>
+		return WebClient.builder().clientConnector(connector).build(); <3>
 	}
 ----
 
-<1> Create shared resources.
+<1> Create resource factory for shared resources.
 <2> Use the `JettyClientHttpConnector` constructor with resource factory.
 <3> Plug the connector into the `WebClient.Builder`.
 ====

src/docs/asciidoc/web/webmvc.adoc

@@ -2359,19 +2359,19 @@ specific controller. This typically lists the names of model attributes or types
 model attributes that should be transparently stored in the session for subsequent
 requests to access.
 
-The following example uses a `@SessionAttributes` annotation:
+The following example uses the `@SessionAttributes` annotation:
 
 ====
 [source,java,indent=0]
 [subs="verbatim,quotes"]
 ----
 	@Controller
-	@SessionAttributes("pet")
+	@SessionAttributes("pet") <1>
 	public class EditPetForm {
 		// ...
 	}
 ----
-<1> Using a `@SessionAttributes` annotation.
+<1> Using the `@SessionAttributes` annotation.
 ====
 
 On the first request, when a model attribute with the name, `pet`, is added to the model,
@@ -2394,13 +2394,14 @@ storage, as the following example shows:
 			if (errors.hasErrors) {
 				// ...
 			}
-				status.setComplete();
+				status.setComplete(); <2>
 				// ...
 			}
 		}
 	}
 ----
-<1> Clearing the `Pet` value from storage.
+<1> Storing the `Pet` value in the Servlet session.
+<2> Clearing the `Pet` value from the Servlet session.
 ====
 
 
@@ -2449,11 +2450,11 @@ or `HandlerInterceptor`):
 [subs="verbatim,quotes"]
 ----
 	@GetMapping("/")
-	public String handle(@RequestAttribute Client client) {
+	public String handle(@RequestAttribute Client client) { <1>
 		// ...
 	}
 ----
-<1> Using a `@RequestAttribute` annotation.
+<1> Using the `@RequestAttribute` annotation.
 ====
 
 

src/docs/asciidoc/web/websocket-intro.adoc

@@ -11,16 +11,17 @@ to upgrade or, in this case, to switch to the WebSocket protocol. The following
 shows such an interaction:
 
 ====
-[subs="quotes"]
+[source,yaml,indent=0]
+[subs="verbatim,quotes"]
 ----
-GET /spring-websocket-portfolio/portfolio HTTP/1.1
-Host: localhost:8080
-Upgrade: websocket <1>
-Connection: Upgrade <2>
-Sec-WebSocket-Key: Uc9l9TMkWGbHFD2qnFHltg==
-Sec-WebSocket-Protocol: v10.stomp, v11.stomp
-Sec-WebSocket-Version: 13
-Origin: http://localhost:8080
+	GET /spring-websocket-portfolio/portfolio HTTP/1.1
+	Host: localhost:8080
+	Upgrade: websocket <1>
+	Connection: Upgrade <2>
+	Sec-WebSocket-Key: Uc9l9TMkWGbHFD2qnFHltg==
+	Sec-WebSocket-Protocol: v10.stomp, v11.stomp
+	Sec-WebSocket-Version: 13
+	Origin: http://localhost:8080
 ----
 <1> The `Upgrade` header.
 <2> Using the `Upgrade` connection.
@@ -30,14 +31,16 @@ Instead of the usual 200 status code, a server with WebSocket support returns ou
 similar to the following:
 
 ====
-[subs="quotes"]
+[source,yaml,indent=0]
+[subs="verbatim,quotes"]
 ----
-**HTTP/1.1 101 Switching Protocols**
-Upgrade: websocket
-Connection: Upgrade
-Sec-WebSocket-Accept: 1qVdfYHU9hPOl4JYYNXF623Gzn0=
-Sec-WebSocket-Protocol: v10.stomp
+	HTTP/1.1 101 Switching Protocols <1>
+	Upgrade: websocket
+	Connection: Upgrade
+	Sec-WebSocket-Accept: 1qVdfYHU9hPOl4JYYNXF623Gzn0=
+	Sec-WebSocket-Protocol: v10.stomp
 ----
+<1> Protocol switch
 ====
 
 After a successful handshake, the TCP socket underlying the HTTP upgrade request remains