update prompts

[harjotgill]

Summary by OpenAI

**Documentation:**
- Updated the instructions in `action.yml` to clarify the scope of code review.
- Revised response instructions and formatting guidelines in `src/prompts.ts` to focus on significant concerns.

> 🎉 Here's to the changes, small but mighty,
> To clearer instructions, making reviews light and sprightly. 
> No more minor issues, only the grand,
> For better code quality, we make our stand! 🚀

[github-actions[bot]]

:robot: OpenAI

High-level Summary:

The changes primarily focus on updating instructions in action.yml and src/prompts.ts. These updates refine the guidelines for code reviews, emphasizing not to comment on minor style issues or missing comments/documentation. While these changes don't alter the code's functionality, a thorough review is recommended due to their potential impact on the system.

Files	Summary
action.yml, src/prompts.ts	The instructions section in action.yml and response instructions in src/prompts.ts have been updated. The changes remove some instructions and update others, focusing on significant concerns during code reviews. Despite no functional changes, a detailed review is advised due to the nature of the modifications.

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Files ignored due to filter (1)

### Ignored files * dist/index.js

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In the recent run, only the files that changed from the base of the PR and between 7818adfa1b1913614a3115c1b48e865e513e0a48 and e902f639a6914c50f5540ee03ac0013224da9b2d commits were reviewed.