Correct indentation in docstring

For some reason Sphinx extremely dislikes this and crashes.

src/transformers/modeling_tf_utils.py

@@ -231,7 +231,7 @@ class TFPreTrainedModel(tf.keras.Model, TFModelUtilsMixin):
 
     def save_pretrained(self, save_directory):
         """ Save a model and its configuration file to a directory, so that it
-            can be re-loaded using the `:func:`~transformers.PreTrainedModel.from_pretrained`` class method.
+            can be re-loaded using the :func:`~transformers.PreTrainedModel.from_pretrained` class method.
         """
         assert os.path.isdir(
             save_directory