fix typo

[pengzhendong]

✨ Description

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🚧 Related Issues

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👨‍💻 Changes Proposed

• [ ] change1
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🛠 TODO

• [ ] task1
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✅ Checklist

• [ ] Code has been reviewed
• [ ] Code complies with the project's code standards and best practices
• [ ] Code has passed all tests
• [ ] Code does not affect the normal use of existing features
• [ ] Code has been commented properly
• [ ] Documentation has been updated (if applicable)
• [ ] Demo/checkpoint has been attached (if applicable)

[yuantuo666]

@pengzhendong Thank you for raising the PR. We got feedback about this issue via WeChat and have already fixed this typo in https://github.com/open-mmlab/Amphion/pull/237.