Docstring refers to setting "blocking" but there doesn't seem to be a place to set the "blocking" property

https://github.com/apache/beam/blob/a297ebd3ffaf5c196d8d0262d762d06491648cef/sdks/python/apache_beam/runners/dataflow/dataflow_runner.py#L93

Start at sdks/python/apache_beam/runners/dataflow/dataflow_runner.py around line 93 and inspect the docstring's reference to the "blocking" setting. Check the surrounding runner API to determine whether that property exists; done means the docstring accurately describes an available setting or no longer refers to one that cannot be configured.

Written by the indexing model from the issue text.