Add Javadoc since for gh-34745

Closes gh-34940

Signed-off-by: Johnny Lim <izeye@naver.com>

spring-web/src/main/java/org/springframework/http/converter/xml/AbstractJaxb2HttpMessageConverter.java

@@ -124,6 +124,7 @@ public abstract class AbstractJaxb2HttpMessageConverter<T> extends AbstractXmlHt
 	 * Detect the charset from the given {@link HttpHeaders#getContentType()}.
 	 * @param httpHeaders the current HTTP headers
 	 * @return the charset defined in the content type header, or {@code null} if not found
+	 * @since 6.2.8
 	 */
 	@Nullable
 	protected Charset detectCharset(HttpHeaders httpHeaders) {

spring-web/src/main/java/org/springframework/http/converter/xml/Jaxb2RootElementHttpMessageConverter.java

@@ -161,6 +161,13 @@ public class Jaxb2RootElementHttpMessageConverter extends AbstractJaxb2HttpMessa
 		}
 	}
 
+	/**
+	 * Process {@code source} with {@code charset}.
+	 * @param source source to process
+	 * @param charset charset to use
+	 * @return source
+	 * @since 6.2.8
+	 */
 	protected Source processSource(Source source, @Nullable Charset charset) {
 		if (source instanceof StreamSource streamSource) {
 			InputSource inputSource = new InputSource(streamSource.getInputStream());