Update gmail.rst

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.3
| Fixed tickets |

Author: ifdattic

cookbook/email/gmail.rst

@@ -33,8 +33,10 @@ In the development configuration file, change the ``transport`` setting to
         <container xmlns="http://symfony.com/schema/dic/services"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:swiftmailer="http://symfony.com/schema/dic/swiftmailer"
-            xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd
-                                http://symfony.com/schema/dic/swiftmailer http://symfony.com/schema/dic/swiftmailer/swiftmailer-1.0.xsd">
+            xsi:schemaLocation="http://symfony.com/schema/dic/services
+                http://symfony.com/schema/dic/services/services-1.0.xsd
+                http://symfony.com/schema/dic/swiftmailer
+                http://symfony.com/schema/dic/swiftmailer/swiftmailer-1.0.xsd">
 
             <!-- ... -->
             <swiftmailer:config