Fix variable name typo in state tutorial

[Copilot]

The "Retrieving a State" example in docs/tutorials/state.md referenced an undefined variable test_id instead of the example_id defined earlier in the snippet.

• docs/tutorials/state.md: Replace test_id with example_id in the get_state_json call

example_id = 4845531975188480
example_state = client.state.get_state_json(example_id)  # was: test_id
example_state['layers'][0]

Original prompt

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This section details on the original issue you should resolve

<issue_title>Typo in JSON State Service Guide</issue_title>
<issue_description>In the guide for the JSON state service (docs/guide/state.rst) in the "Retrieving a State" section, the example given says:

example_id = 4845531975188480
example_state = client.state.get_state_json(test_id)
example_state['layers'][0]

The argument 'test_id' should be 'example_id'. It's a small error, but it might confuse a new user.</issue_description>

<agent_instructions>fix the issue described here in the json state server examples documentation</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Typo in JSON State Service Guide #333

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