Update PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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 ### Description of changes:
+* [ ] Please add an explanation of what your changes do and why you'd like us to include them.
 
+#### All PRs Checklist:
 * [ ] Have you followed the guidelines in our [Contributor's Guide](https://ncar.github.io/CUPiD/ContributorGuide.html)?
 * [ ] Have you checked to ensure there aren't other open [Pull Requests](../../../pulls) for the same update/change?
 * [ ] Have you made sure that the [`pre-commit` checks passed (#8 in Adding Notebooks Guide)](https://ncar.github.io/CUPiD/addingnotebookstocollection.html)?
-* [ ] Have you [hidden the code cells (#8 in Adding Notebooks Guide)](https://ncar.github.io/CUPiD/addingnotebookstocollection.html) in your notebook?
-* [ ] Have you added an explanation of what your changes do and why you'd like us to include them?
 * [ ] Have you successfully tested your changes locally?
-* [ ] Have you moved any observational data that you are using to `/glade/campaign/cesm/development/cross-wg/diagnostic_framework/CUPiD_obs_data` and ensured that it follows this format within that directory: `COMPONENT/analysis_datasets/RESOLUTION/PROCESSED_FIELD_TYPE`?
+
+#### New notebook PR Additional Checklist:
+* [ ] Have you [hidden the code cells (#8 in Adding Notebooks Guide)](https://ncar.github.io/CUPiD/addingnotebookstocollection.html) in your notebook?
+* [ ] Have you removed any unused parameters from your cell tagged with `parameters`? These can cause confusing warnings that show up as `DAG build with warnings`.
+* [ ] Have you moved any observational data that you are using to `/glade/campaign/cesm/development/cross-wg/diagnostic_framework/CUPiD_obs_data` and ensured that it follows this format within that directory: `COMPONENT/analysis_datasets/RESOLUTION/PROCESSED_FIELD_TYPE?