Remove unnecessary AllenNLP comments

combo/data/dataset_readers/dataset_reader.py

@@ -64,17 +64,6 @@ class DatasetReader(IterableDataset):
             yield instance
 
     def _read(self) -> Iterable[Instance]:
-        """
-        Reads the instances from the given `file_path` and returns them as an
-        `Iterable`.
-        You are strongly encouraged to use a generator so that users can
-        read a dataset in a lazy way, if they so choose.
-        """
-        # NOTE: `file_path` is left untyped here on purpose.
-        # Technically the type should be `DatasetReaderInput`, but many subclass
-        # implementations of `DatasetReader` define their `_read()` method to take a more
-        # specific type, such as just `str`. But that would be a type error
-        # according to mypy: https://mypy.readthedocs.io/en/stable/common_issues.html#incompatible-overrides
         raise NotImplementedError
 
     def apply_token_indexers(self, instance: Instance) -> None: