Remove arbitrary line number from github link

docs/en/reference/caching.rst

@@ -48,4 +48,4 @@ object is closed:
 
 .. warning::
 
-    When using the cache layer not all fetch modes are supported. See the code of the `ResultCacheStatement <https://github.com/doctrine/dbal/blob/master/lib/Doctrine/DBAL/Cache/ResultCacheStatement.php#L156>`_ for details.
+    When using the cache layer not all fetch modes are supported. See the code of the `ResultCacheStatement <https://github.com/doctrine/dbal/blob/master/lib/Doctrine/DBAL/Cache/ResultCacheStatement.php>`_ for details.