add PR template

.github/PULL_REQUEST_TEMPLATE/docs-update-pr.md

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+<!--This PR template should be used if you are updating documentation.
+If you are not updating the docs, you can delete this template and start your PR from scratch.-->
+
+#### Which issue does this address?
+
+
+#### Which docs tree issue are these docs associated with?
+<!-- For example, this issue is a docs tree issue: https://github.com/AlexsLemonade/OpenScPCA-analysis/issues/9 -->
+
+
+#### Briefly describe the scope of the added docs file, including whether you link out to any external docs.
+<!-- If you are adding more than one docs file, are they related to one another?-->
+<!-- Are you adding any visual aids? Or, see next section if you think these docs would benefit from aids: -->
+
+
+#### Will you need additional visual aids for these docs?
+
+
+#### Any other comments for reviewers?
+
+
+#### Reviewer checklist
+
+Please refer to the [docs style guide](https://github.com/AlexsLemonade/OpenScPCA-admin/blob/main/writing-style-guide/general-style-guide.md) while reviewing this pull request.
+
+- [ ] Do the docs adhere to the style guide [**structure directions**](https://github.com/AlexsLemonade/OpenScPCA-admin/blob/main/writing-style-guide/general-style-guide.md#structure)?
+- [ ] Do the docs adhere to the style guide [**language directions**](https://github.com/AlexsLemonade/OpenScPCA-admin/blob/main/writing-style-guide/general-style-guide.md#structure)?
+- [ ] Do the docs adhere to the style guide [**tone directions**](https://github.com/AlexsLemonade/OpenScPCA-admin/blob/main/writing-style-guide/general-style-guide.md#tone)?