Update JavaDoc in ServerHttpSecurity's OAuth2ResourceServerSpec to document authenticationSuccessHandler

Author: iain-henderson

config/src/main/java/org/springframework/security/config/web/server/ServerHttpSecurity.java

@@ -297,6 +297,7 @@
  * @author Ankur Pathak
  * @author Alexey Nesterov
  * @author Yanming Zhou
+ * @author Iain Henderson
  * @since 5.0
  */
 public class ServerHttpSecurity {
@@ -4188,6 +4189,13 @@ public OAuth2ResourceServerSpec authenticationFailureHandler(
 			return this;
 		}
 
+		/**
+		 * Configures the {@link ServerAuthenticationSuccessHandler} to use. The default is
+		 * {@link WebFilterChainServerAuthenticationSuccessHandler}
+		 * @param authenticationSuccessHandler the {@link ServerAuthenticationSuccessHandler} to use
+		 * @return the {@link OAuth2ClientSpec} to customize
+		 * @since 7.1
+		 */
 		public OAuth2ResourceServerSpec authenticationSuccessHandler(
 				ServerAuthenticationSuccessHandler authenticationSuccessHandler) {
 			this.authenticationSuccessHandler = authenticationSuccessHandler;