Update mailer.rst

Co-Authored-By: Wouter J <[email protected]>

Author: weaverryan

mailer.rst

@@ -305,7 +305,7 @@ for Twig templates::
         // path of the Twig template to render
         ->htmlTemplate('emails/signup.html.twig')
 
-        // pass variable (name => value) to the template
+        // pass variables (name => value) to the template
         ->context([
             'expiration_date' => new \DateTime('+7 days'),
             'username' => 'foo',