[Doctest] Add configuration_transfo_xl.py (#19651)

Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>

src/transformers/models/transfo_xl/configuration_transfo_xl.py

@@ -97,7 +97,7 @@ class TransfoXLConfig(PretrainedConfig):
     >>> # Initializing a Transformer XL configuration
     >>> configuration = TransfoXLConfig()
 
-    >>> # Initializing a model from the configuration
+    >>> # Initializing a model (with random weights) from the configuration
     >>> model = TransfoXLModel(configuration)
 
     >>> # Accessing the model configuration

utils/documentation_tests.txt

@@ -114,6 +114,7 @@ src/transformers/models/swinv2/configuration_swinv2.py
 src/transformers/models/time_series_transformer/configuration_time_series_transformer.py
 src/transformers/models/time_series_transformer/modeling_time_series_transformer.py
 src/transformers/models/trajectory_transformer/configuration_trajectory_transformer.py
+src/transformers/models/transfo_xl/configuration_transfo_xl.py
 src/transformers/models/trocr/configuration_trocr.py
 src/transformers/models/trocr/modeling_trocr.py
 src/transformers/models/unispeech/configuration_unispeech.py