docs(langgraph): fixing human_in_the_loop demo code

[limingzhong61]

docs(langgraph): fixing human_in_the_loop demo code

• Description: In the demo code,term 'config' is undefined. Based on the context, the correct term here should be 'thread' in code : print(graph.get_state(config))

# Thread
thread = {"configurable": {"thread_id": "1"}}

# Run the graph until the first interruption
for event in graph.stream(initial_input, thread, stream_mode="values"):
    print(event)

# This will run until the breakpoint
# You can get the state of the graph at this point
print(graph.get_state(config))

# You can continue the graph execution by passing in `None` for the input
for event in graph.stream(None, thread, stream_mode="values"):
    print(event)

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