Adding config files for convnext
diff --git a/src/transformers/models/convnext/configuration_convnext.py b/src/transformers/models/convnext/configuration_convnext.py
index 8e435b1ed1d9a..d214cfcb1bd67 100644
--- a/src/transformers/models/convnext/configuration_convnext.py
+++ b/src/transformers/models/convnext/configuration_convnext.py
@@ -67,12 +67,14 @@ class ConvNextConfig(PretrainedConfig):
 
     Example:
     ```python
-    >>> from transformers import ConvNextModel, ConvNextConfig
+    >>> from transformers import ConvNextConfig, ConvNextModel
 
     >>> # Initializing a ConvNext convnext-tiny-224 style configuration
     >>> configuration = ConvNextConfig()
-    >>> # Initializing a model from the convnext-tiny-224 style configuration
+
+    >>> # Initializing a model (with random weights) from the convnext-tiny-224 style configuration
     >>> model = ConvNextModel(configuration)
+
     >>> # Accessing the model configuration
     >>> configuration = model.config
     ```"""
diff --git a/utils/documentation_tests.txt b/utils/documentation_tests.txt
index e1a33d70cafa3..78b595df0e851 100644
--- a/utils/documentation_tests.txt
+++ b/utils/documentation_tests.txt
@@ -37,6 +37,7 @@ src/transformers/models/codegen/configuration_codegen.py
 src/transformers/models/conditional_detr/configuration_conditional_detr.py
 src/transformers/models/conditional_detr/modeling_conditional_detr.py
 src/transformers/models/convbert/configuration_convbert.py
+src/transformers/models/convnext/configuration_convnext.py
 src/transformers/models/convnext/modeling_convnext.py
 src/transformers/models/ctrl/configuration_ctrl.py
 src/transformers/models/ctrl/modeling_ctrl.py
@@ -79,7 +80,7 @@ src/transformers/models/longt5/modeling_longt5.py
 src/transformers/models/marian/modeling_marian.py
 src/transformers/models/markuplm/modeling_markuplm.py
 src/transformers/models/mbart/modeling_mbart.py
-src/transformers/models/megatron_bert/configuration_megatron_bert.py 
+src/transformers/models/megatron_bert/configuration_megatron_bert.py
 src/transformers/models/mobilebert/configuration_mobilebert.py
 src/transformers/models/mobilebert/modeling_mobilebert.py
 src/transformers/models/mobilebert/modeling_tf_mobilebert.py

# What does this PR do?
Adding config files for convnext
Based on issue: https://github.com/huggingface/transformers/issues/19487

@ydshieh could you please check it?
Thanks :)