Update files from the datasets library (from 1.16.0)

Release notes: https://github.com/huggingface/datasets/releases/tag/1.16.0

hippocorpus.py

@@ -108,9 +108,7 @@ class Hippocorpus(datasets.GeneratorBasedBuilder):
 
         if not os.path.exists(data_dir):
             raise FileNotFoundError(
-                "{} does not exist. Make sure you insert a manual dir via `datasets.load_dataset('hippocorpus', data_dir=...)` that includes files unzipped from the hippocorpus zip. Manual download instructions: {}".format(
-                    data_dir, self.manual_download_instructions
-                )
+                "{data_dir} does not exist. Make sure you insert a manual dir via `datasets.load_dataset('hippocorpus', data_dir=...)` that includes files unzipped from the hippocorpus zip. Manual download instructions: {self.manual_download_instructions}"
             )
         return [
             datasets.SplitGenerator(