Update translators comment to match WP Core examples. Fix lint errors

mailchimp.php

@@ -40,15 +40,14 @@
 } else {
 	add_action(
 		'admin_notices',
-		function() {
+		function () {
 			?>
 			<div class="notice notice-error">
 				<p>
 					<?php
 					echo wp_kses_post(
 						sprintf(
-							/* translators: %1$s is the command that needs to be run. */
-							/* translators: %2$s is the support URL. */
+							/* translators: 1: Command to run, e.g., <code>composer install</code>, 2: Support URL, e.g., https://wordpress.org/support/plugin/mailchimp/. */
 							__( 'The composer autoload file is not found or not readable. Please contact <a href="%2$s" target="_blank">support</a> if you\'re a user. Please run %1$s if you\'re a developer in a development environment.', 'mailchimp' ),
 							'<code>composer install</code>',
 							'https://wordpress.org/support/plugin/mailchimp/'