Update issue templates

.github/ISSUE_TEMPLATE/---documentation-improvement.md

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+---
+name: "\U0001F4D6 Documentation Improvement"
+about: Suggest improvements to our documentation
+title: "[Docs] "
+labels: Documentation
+assignees: Nikhil-Nandagopal
+
+---
+
+## Documentation Link 
+
+Add a link to the page which needs improvement (if relevant)
+
+## Describe the problem
+
+Is the documentation missing? Or is it confusing? Why is it confusing?
+
+## Describe the improvement
+
+A clear and concise description of the improvement.