Typo fix in error message (#29535)

src/transformers/tokenization_utils_base.py

@@ -1594,7 +1594,7 @@ def __init__(self, **kwargs):
         self.truncation_side = kwargs.pop("truncation_side", self.truncation_side)
         if self.truncation_side not in ["right", "left"]:
             raise ValueError(
-                f"Padding side should be selected between 'right' and 'left', current value: {self.truncation_side}"
+                f"Truncation side should be selected between 'right' and 'left', current value: {self.truncation_side}"
             )
 
         self.model_input_names = kwargs.pop("model_input_names", self.model_input_names)