Use lambda DSL in logout header docs

docs/modules/ROOT/pages/servlet/exploits/headers.adoc

@@ -914,8 +914,9 @@ WebSecurityConfigurerAdapter {
 	protected void configure(HttpSecurity http) throws Exception {
 		http
 			// ...
-			.logout()
-				.addLogoutHandler(new HeaderWriterLogoutHandler(new ClearSiteDataHeaderWriter(CACHE, COOKIES)));
+			.logout((logout) -> logout
+                .addLogoutHandler(new HeaderWriterLogoutHandler(new ClearSiteDataHeaderWriter(CACHE, COOKIES)))
+			);
 	}
 }
 ----