docs: update manual_prompt_tuning.md

[eltociear]

Description

paramater -> parameter

Proposed Changes

[List the specific changes made in this pull request.]

Checklist

• [ ] I have tested these changes locally.
• [ ] I have reviewed the code changes.
• [ ] I have updated the documentation (if necessary).
• [ ] I have added appropriate unit tests (if applicable).

Additional Notes

[Add any additional notes or context that may be helpful for the reviewer(s).]