minor symfony#7977 Fix typo in a class name (apflieger)

This PR was submitted for the master branch but it was merged into the 3.3 branch instead (closes symfony#7977).

Discussion
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Fix typo in a class name

EnityManagerInterface -> En(t)ityManagerInterface

Commits
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0a83630 Fix typo in a class name

Author: xabbuh

doctrine.rst

@@ -633,9 +633,9 @@ Fetching an object back out of the database is even easier. For example,
 suppose you've configured a route to display a specific ``Product`` based
 on its ``id`` value::
 
-    use Doctrine\ORM\EnityManagerInterface;
+    use Doctrine\ORM\EntityManagerInterface;
 
-    public function showAction($productId, EnityManagerInterface $em)
+    public function showAction($productId, EntityManagerInterface $em)
     {
         $product = $em->getRepository('AppBundle:Product')
             ->find($productId);
@@ -727,7 +727,7 @@ Updating an Object
 Once you've fetched an object from Doctrine, updating it is easy. Suppose
 you have a route that maps a product id to an update action in a controller::
 
-    use Doctrine\ORM\EnityManagerInterface;
+    use Doctrine\ORM\EntityManagerInterface;
 
     public function updateAction($productId, EntityManagerInterface $em)
     {