Update how-to-batch-scoring-script.md

Author: santiagxf

articles/machine-learning/how-to-batch-scoring-script.md

@@ -54,7 +54,7 @@ Notice that in this example we are placing the model in a global variable `model
 Use the `run(mini_batch: List[str]) -> Union[List[Any], pandas.DataFrame]` method to perform the scoring of each mini-batch generated by the batch deployment. Such method will be called once per each `mini_batch` generated for your input data. Batch deployments read data in batches accordingly to how the deployment is configured.
 
 ```python
-def run(mini_batch):
+def run(mini_batch: List[str]) -> Union[List[Any], pandas.DataFrame]:
     results = []
 
     for file in mini_batch: