minor #13996 [Mailer] Update mailer.rst (ThomasLandauer)

This PR was squashed before being merged into the 4.4 branch.

Discussion
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[Mailer] Update mailer.rst

Adding the word "array" cause I searched for it, and since I didn't find it, opened this (bogus) issue: symfony/symfony#37657

Also added `addCc()` explicitly, since I also searched for this ;-)

Commits
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b51618f [Mailer] Update mailer.rst

Author: javiereguiluz

mailer.rst

@@ -274,12 +274,13 @@ both strings or address objects::
     :class:`Symfony\\Component\\Mailer\\Event\\MessageEvent` event to set the
     same ``From`` email to all messages.
 
-Multiple addresses are defined with the ``addXXX()`` methods::
+Multiple addresses can be set with ``addTo()``, ``addCc()``, or ``addBcc()``::
 
     $email = (new Email())
         ->to('foo@example.com')
         ->addTo('bar@example.com')
-        ->addTo('baz@example.com')
+        ->cc('cc@example.com')
+        ->addCc('cc2@example.com')
 
         // ...
     ;
@@ -289,7 +290,7 @@ Alternatively, you can pass multiple addresses to each method::
     $toAddresses = ['foo@example.com', new Address('bar@example.com')];
 
     $email = (new Email())
-        ->to(...$toAddresses)
+        ->to(...$toAddresses) // use the splat operator if you have an array
         ->cc('cc1@example.com', 'cc2@example.com')
 
         // ...