Docs: Improve inline comments per the documentation standards.

Includes minor code layout fixes for better readability.

See #48303.
Built from https://develop.svn.wordpress.org/trunk@47122


git-svn-id: http://core.svn.wordpress.org/trunk@46922 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/network/themes.php

@@ -177,7 +177,7 @@ if ( $action ) {
 				<?php
 				require_once( ABSPATH . 'wp-admin/admin-footer.php' );
 				exit;
-			} // Endif verify-delete
+			} // End if verify-delete.
 
 			foreach ( $themes as $theme ) {
 				$delete_result = delete_theme(