Update doctrine.rst

Author: hectorprats

reference/configuration/doctrine.rst

@@ -161,7 +161,8 @@ getConnection method and the name of the connection::
 .. code-block:: php
 
     $connection = $this->getDoctrine()->getConnection('customer');
-    $result = $connection->fetchAll('select * from table');
+    $result = $connection->fetchAll('select name from customer');
+::
 
 Doctrine ORM Configuration
 --------------------------