Update index.rst

There is no reason for the use ContainerInterface with the ContainerAwareTrait.
doctrine · Mar 12, 2018 · 30b9045 · 30b9045
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diff --git a/Resources/doc/index.rst b/Resources/doc/index.rst
@@ -349,7 +349,6 @@ With the trait
 
     // ...
     use Symfony\Component\DependencyInjection\ContainerAwareInterface;
-    use Symfony\Component\DependencyInjection\ContainerInterface;
     use Symfony\Component\DependencyInjection\ContainerAwareTrait;
 
     class Version20130326212938 extends AbstractMigration implements ContainerAwareInterface