Update ClientHttpRequestInterceptor javadoc

Clarify the interceptor is responsible for closing the response
if it throws an exception after receiving it.

Closes gh-29751

spring-web/src/main/java/org/springframework/http/client/ClientHttpRequestInterceptor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -21,14 +21,10 @@ import java.io.IOException;
 import org.springframework.http.HttpRequest;
 
 /**
- * Intercepts client-side HTTP requests. Implementations of this interface can be
- * {@linkplain org.springframework.web.client.RestTemplate#setInterceptors registered}
- * with the {@link org.springframework.web.client.RestTemplate RestTemplate},
- * as to modify the outgoing {@link ClientHttpRequest} and/or the incoming
- * {@link ClientHttpResponse}.
- *
- * <p>The main entry point for interceptors is
- * {@link #intercept(HttpRequest, byte[], ClientHttpRequestExecution)}.
+ * Contract to intercept client-side HTTP requests. Implementations can be
+ * registered with {@link org.springframework.web.client.RestClient} or
+ * {@link org.springframework.web.client.RestTemplate} to modify the outgoing
+ * request and/or the incoming response.
  *
  * @author Arjen Poutsma
  * @since 3.1
@@ -55,6 +51,8 @@ public interface ClientHttpRequestInterceptor {
 	 * </ul>
 	 * <li>Optionally wrap the response to filter HTTP attributes.</li>
 	 * </ol>
+	 * <p>Note: if the interceptor throws an exception after receiving a response,
+	 * it must close the response via {@link ClientHttpResponse#close()}.
 	 * @param request the request, containing method, URI, and headers
 	 * @param body the body of the request
 	 * @param execution the request execution