Update HttpWebServiceMessageSenderBuilder javadoc

Update the return javadoc from "@return a new builder instance" to
"@return the current builder instance".

See gh-42868

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/webservices/client/HttpWebServiceMessageSenderBuilder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2024 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.
@@ -48,7 +48,7 @@ public class HttpWebServiceMessageSenderBuilder {
 	/**
 	 * Set the connection timeout.
 	 * @param connectTimeout the connection timeout
-	 * @return a new builder instance
+	 * @return the current builder instance
 	 */
 	public HttpWebServiceMessageSenderBuilder setConnectTimeout(Duration connectTimeout) {
 		this.connectTimeout = connectTimeout;
@@ -58,7 +58,7 @@ public class HttpWebServiceMessageSenderBuilder {
 	/**
 	 * Set the read timeout.
 	 * @param readTimeout the read timeout
-	 * @return a new builder instance
+	 * @return the current builder instance
 	 */
 	public HttpWebServiceMessageSenderBuilder setReadTimeout(Duration readTimeout) {
 		this.readTimeout = readTimeout;
@@ -68,7 +68,7 @@ public class HttpWebServiceMessageSenderBuilder {
 	/**
 	 * Set an {@link SslBundle} that will be used to configure a secure connection.
 	 * @param sslBundle the SSL bundle
-	 * @return a new builder instance
+	 * @return the current builder instance
 	 */
 	public HttpWebServiceMessageSenderBuilder sslBundle(SslBundle sslBundle) {
 		this.sslBundle = sslBundle;
@@ -79,7 +79,7 @@ public class HttpWebServiceMessageSenderBuilder {
 	 * Set the {@code Supplier} of {@link ClientHttpRequestFactory} that should be called
 	 * to create the HTTP-based {@link WebServiceMessageSender}.
 	 * @param requestFactorySupplier the supplier for the request factory
-	 * @return a new builder instance
+	 * @return the current builder instance
 	 */
 	public HttpWebServiceMessageSenderBuilder requestFactory(
 			Supplier<ClientHttpRequestFactory> requestFactorySupplier) {
@@ -93,7 +93,7 @@ public class HttpWebServiceMessageSenderBuilder {
 	 * {@link ClientHttpRequestFactory} that should be called to create the HTTP-based
 	 * {@link WebServiceMessageSender}.
 	 * @param requestFactoryFunction the function for the request factory
-	 * @return a new builder instance
+	 * @return the current builder instance
 	 * @since 3.0.0
 	 */
 	public HttpWebServiceMessageSenderBuilder requestFactory(