Comment PR guidance (#39)

PULL_REQUEST_TEMPLATE.md

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+<!--
 Thank you 🙏 for your contribution to [Ultralytics](https://ultralytics.com) 🚀! Your effort in enhancing our repositories is greatly appreciated. To streamline the process and assist us in integrating your Pull Request (PR) effectively, please follow these steps:
 
 1. **Check for Existing Contributions**: Before submitting, kindly explore existing PRs to ensure your contribution is unique and complementary.
-
 2. **Link Related Issues**: If your PR addresses an open issue, please link it in your submission. This helps us better understand the context and impact of your contribution.
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 3. **Elaborate Your Changes**: Clearly articulate the purpose of your PR. Whether it's a bug fix or a new feature, a detailed description aids in a smoother integration process.
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 4. **Ultralytics Contributor License Agreement (CLA)**: To uphold the quality and integrity of our project, we require all contributors to sign the CLA. Please confirm your agreement by commenting below:
 
     _I have read the CLA Document and I hereby sign the CLA_
 
 For more detailed guidance and best practices on contributing, refer to our ✅ [Contributing Guide](https://docs.ultralytics.com/help/contributing). Your adherence to these guidelines ensures a faster and more effective review process.
+--->