Update PR template

[samaloney]

Thank you for contributing to SunPy

🚨 IMPORTANT 🚨

We know that working on code and submitting pull requests takes effort, and we appreciate your time.
Thank you.

Please be aware that everyone has to follow our code of conduct

Furthermore, you might need to check with your work place if you are allowed to contribute code

• Please try to create an issue before creating a Pull Request.
• Please use the following Git commit message style
  • Use the future tense ("Adds feature" not "Added feature")
  • Limit the first line to 72 characters or less
• Be wary of posting output from Large Language Models or similar generative AI as comments on GitHub or any other platform, as such comments tend to be formulaic and low quality content.
  If you use generative AI tools as an aid in developing code or documentation changes, ensure that you fully understand the proposed changes and can explain why they are the correct approach and an improvement to the current state.

We have several automatic features that run when a pull request is open.
They can appear daunting but do not worry about them!
This a brief explanation of them.

↑👆 DELETE above before submitting 👆↑

PR Description