Update inverted_pendulum_v4.py

[RatanPrakash]

typos fixed

Description

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Fixes # (issue)

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
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• I have run the pre-commit checks with pre-commit run --all-files (see CONTRIBUTING.md instructions to set it up)
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
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• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[pseudo-rnd-thoughts]

Thanks for spotting that but Gym is not being updated anymore and has been fixed on Gymnasium, https://gymnasium.farama.org/main/environments/mujoco/inverted_pendulum/#termination