estored the Address::fromString() example

Author: javiereguiluz

mailer.rst

@@ -151,6 +151,10 @@ both strings or address objects::
         // (email clients will display the name)
         ->from(new NamedAddress('fabien@example.com', 'Fabien'))
 
+        // defining the email address and name as a string
+        // (the format must match: 'Name <email@example.com>')
+        ->from(Address::fromString('Fabien Potencier <fabien@example.com>'))
+
         // ...
     ;