Add docs issue template

.github/ISSUE_TEMPLATE/03_documentation.md

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+---
+name: Documentation
+about: Something should be added to or fixed in the documentation
+
+---
+
+
+### What sort(s) of issue is this?
+- [ ] Something is missing.
+- [ ] Something is (or might be) incorrect.
+- [ ] Something is confusing.
+- [ ] Something is broken.
+
+### What part(s) of the documentation does this concern?
+- [ ] [Technical Note](https://escomp.github.io/ctsm-docs/versions/master/html/tech_note/index.html) (science and design of the model)
+- [ ] [User's Guide](https://escomp.github.io/ctsm-docs/versions/master/html/users_guide/index.html) (using the model and related tools)
+- [ ] Somewhere else (e.g., README file, tool help text, or code comment): _Please specify_
+- [ ] I don't know
+
+### Describe the issue
+A clear and concise description of what is missing or wrong.
+
+### Additional context (optional)
+Add any other context or screenshots about the issue here.

.github/ISSUE_TEMPLATE/04_other.md

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+---
+name: Other
+about: Other issues (enhancement, cleanup, etc.)
+
+---
+
+