Parallelism Documentation Improvements

[mdrideout]

Documentation updates only.

Changes

• RunnableGraph halt_after example updated to List[str] to match RunnableGraph create() method: return RunnableGraph(graph=graph, entrypoint=action.name, halt_after=[action.name])
• Imports corrected / added to clarify where classes used in the example are declared

Checklist

• PR has an informative and human-readable title (this will be pulled into the release notes)
• Changes are limited to a single goal (no scope creep)
• Code passed the pre-commit check & code is left cleaner/nicer than when first encountered.
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future TODOs are captured in comments
• Project documentation has been updated if adding/changing functionality.

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Important

Update parallelism.rst to correct RunnableGraph example and imports for clarity.

• Documentation:
  • Update RunnableGraph halt_after example to List[str] to match create() method.
  • Add missing import for RunnableGraph in parallelism.rst.
  • Correct imports to clarify class declarations in examples.

^{This description was created by for 22f6f9f. It will automatically update as commits are pushed.}

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[skrawcz]

Thanks @mdrideout !