docs: add documentation issue template

.github/ISSUE_TEMPLATE/documentation_issue.md

@@ -0,0 +1,19 @@
+---
+name: Documentation issue
+about: Report missing, incorrect, or unclear documentation
+title: '[DOCS] '
+labels: documentation
+assignees: ''
+---
+
+**Describe the documentation issue**
+A clear and concise description of what's missing, incorrect, or unclear.
+
+**Location**
+Link or path to the relevant documentation page/file.
+
+**Suggested improvement**
+If you have an idea for how to fix it, describe it here.
+
+**Additional context**
+Add any other context or screenshots about the documentation issue here.