style: Add missing docstring

Author: dbanty

openapi_python_client/parser/openapi.py

@@ -417,6 +417,7 @@ def response_type(self) -> str:
         return f"Union[{', '.join(types)}]"
 
     def all_parameters(self) -> Iterator[Property]:
+        """Iterate through all the parameters of this endpoint """
         yield from self.path_parameters.values()
         yield from self.query_parameters.values()
         yield from self.header_parameters.values()