Update doctrine.rst

Author: guiguiboy

book/doctrine.rst

@@ -747,8 +747,8 @@ normal ``Query`` object, which can be used to get the result of the query.
     (``:price`` in the example above) as it prevents SQL injection attacks.
 
 The ``getResult()`` method returns an array of results. To get only one
-result, you can use ``getSingleResult()`` (which throws exception there is no
-result) or ``getOneOrNullResult()``::
+result, you can use ``getSingleResult()`` (which throws an exception if there
+is no result) or ``getOneOrNullResult()``::
 
     $product = $query->getOneOrNullResult();