Update documentation on caching

docs/en/reference/caching.rst

@@ -35,15 +35,13 @@ the default cache instance:
     new QueryCacheProfile(0, "some key", $cache);
 
 In order for the data to actually be cached its necessary to ensure that the entire
-result set is read (the easiest way to ensure this is to use ``fetchAll``) and the statement
-object is closed:
+result set is read (the easiest way to ensure this is to use one of the ``fetchAll*()`` methods):
 
 ::
 
     <?php
     $stmt = $conn->executeCacheQuery($query, $params, $types, new QueryCacheProfile(0, "some key"));
     $data = $stmt->fetchAllAssociative();
-    $stmt->closeCursor(); // at this point the result is cached
 
 .. warning::