Fix amount of spaces

Author: gisostallenberg

mailer.rst

@@ -159,7 +159,7 @@ Multiple addresses are defined with the ``addXXX()`` methods::
 
 An ``Address`` can be created from a single string::
 
-     $email = (new Email())
+    $email = (new Email())
         ->from(Address::fromString('Fabien <fabien@example.com>'))
 
         // ...