Fix lint: wrap long comment at line 808

Author: Eliaaazzz

sdks/python/apache_beam/transforms/external.py

@@ -804,8 +804,9 @@ def expand(self, pvalueish: pvalue.PCollection) -> pvalue.PCollection:
               spec=beam_runner_api_pb2.FunctionSpec(
                   urn=common_urns.primitives.IMPULSE.urn),
               outputs={'out': transform_proto.inputs[tag]}))
-    output_coders = None
-    # Retrieve type hints and store them in variables to avoid duplicate calls and AttributeError
+              
+    # Retrieve type hints and store them in variables 
+    # to avoid duplicate calls and AttributeError
     hints = self.get_type_hints()
     output_coders = None
     if hints.output_types: