minor #9265 Duplicate import in sample service.rst (SpacePossum)

This PR was merged into the 3.4 branch.

Discussion
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Duplicate import in sample service.rst

Little copy paste it seems, on 3.4 only.

Commits
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ecf3110 Update service.rst

Author: javiereguiluz

controller/service.rst

@@ -29,9 +29,6 @@ syntax:
         // src/AppBundle/Controller/HelloController.php
 
         // You need to use Sensio's annotation to specify a service id
-        use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
-        // ...
-
         use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
 
         /**