Update issue templates

.github/ISSUE_TEMPLATE/documentation-improvement.md

@@ -0,0 +1,14 @@
+---
+name: Documentation improvement
+about: Tell us where the documentation can be improved
+title: ''
+labels: documentation
+assignees: ''
+
+---
+
+**Describe what you would like to be improved or added**
+A concise description of what part of the documentation needs improvement or what part of the project needs more documentation.
+
+**If applicable describe why it needs to be improved**
+A brief explanation of why the current documentation needs improvement