Fix code comments

src/MDMailerHelper.php

@@ -1,6 +1,6 @@
 <?PHP
 /**
- * Wrapper class around mysqli.
+ * Contains a class MDMailerHelper for improved handling of mails in the md ecosystem.
  */
 declare(strict_types = 1);
 
@@ -9,12 +9,12 @@ use PHPMailer\PHPMailer\SMTP;
 use PHPMailer\PHPMailer\Exception;
 
 /**
- * MD mysqli wrapper.
+ * Class containing static functions for an easier handling of mails.
  */
 final class MDMailerHelper {
 
     /**
-     * PHP-encrypts a message to a given email address.
+     * PGP-encrypts a message to a given email address.
      *
      * @param string $to  Recipient email address.
      * @param string $msg Message contents.