[docs] fix invalid class name (#11438)

* fix invalid class name

* proper ref

* proper ref

docs/source/migration.md

@@ -169,8 +169,8 @@ Regarding the `TFTrainer` class:
 - The `TFTrainer` method `_setup_wandb` is deprecated in favor of `setup_wandb`.
 - The `TFTrainer` method `_run_model` is deprecated in favor of `run_model`.
 
-Regarding the `TrainerArgument` class:
-- The `TrainerArgument` argument `evaluate_during_training` is deprecated in favor of `evaluation_strategy`.
+Regarding the `TrainingArguments` class:
+- The `TrainingArguments` argument `evaluate_during_training` is deprecated in favor of `evaluation_strategy`.
 
 Regarding the Transfo-XL model:
 - The Transfo-XL configuration attribute `tie_weight` becomes `tie_words_embeddings`.

src/transformers/integrations.py

@@ -856,8 +856,8 @@ class MLflowCallback(TrainerCallback):
                 Whether to use MLflow .log_artifact() facility to log artifacts.
 
                 This only makes sense if logging to a remote server, e.g. s3 or GCS. If set to `True` or `1`, will copy
-                whatever is in TrainerArgument's output_dir to the local or remote artifact storage. Using it without a
-                remote storage will just copy the files to your artifact location.
+                whatever is in :class:`~transformers.TrainingArguments`'s ``output_dir`` to the local or remote
+                artifact storage. Using it without a remote storage will just copy the files to your artifact location.
         """
         log_artifacts = os.getenv("HF_MLFLOW_LOG_ARTIFACTS", "FALSE").upper()
         if log_artifacts in {"TRUE", "1"}: