Fix code quality

Author: sgugger

examples/language-modeling/run_language_modeling.py

@@ -91,10 +91,11 @@ class DataTrainingArguments:
         default=None, metadata={"help": "The input training data file (a text file)."}
     )
     train_data_files: Optional[str] = field(
-        default=None, metadata={
+        default=None,
+        metadata={
             "help": "The input training data files (multiple files in glob format). "
-                    "Very often splitting large files to smaller files can prevent tokenizer going out of memory"
-        }
+            "Very often splitting large files to smaller files can prevent tokenizer going out of memory"
+        },
     )
     eval_data_file: Optional[str] = field(
         default=None,