Update issue templates

.github/ISSUE_TEMPLATE/documentation-request.md

@@ -0,0 +1,22 @@
+---
+name: Documentation request
+about: Suggest an improvement to the documentation
+title: ''
+labels: 0 - Backlog, documentation
+assignees: ryanheise
+
+---
+
+**To which pages does your suggestion apply?**
+
+- Direct URL 1
+- Direct URL 2
+- ...
+
+**Quote the sentences(s) from the documentation to be improved (if any)**
+
+> Insert here. (Skip if you are proposing an entirely new section.)
+
+**Describe your suggestion**
+
+...