Function display_graph() in example do not exist

Here in code an example of using PipelineGraph class. Example in comments contains function display_graph() which do not exist.

https://github.com/apache/beam/blob/master/sdks/python/apache_beam/runners/interactive/display/pipeline_graph.py#L47

Examples: graph = pipeline_graph.PipelineGraph(pipeline_proto)

graph.display_graph()

or

graph = pipeline_graph.PipelineGraph(pipeline)

graph.display_graph()