Fixed typos

[RistoAle97]

Fixed some typos here and there (mainly in the docstrings and comments) by using typos, I suggest adding its hook inside .pre-commit-config.yaml.

[chaofengc]

Thank you so much for your contribution! We have a codespell check hook in the .pre-commit-config.yaml, but the pre-commit hooks are currently disabled for faster development. I apologize for any inconvenience this may have caused.