Create documentation update PR template

Add a pull request template for documentation updates.

Author: anshumanjadiya1102

.github/PULL_REQUEST_TEMPLATE.md/documentation_pr.md

@@ -0,0 +1,17 @@
+---
+name: 🧾 Documentation Update PR
+about: Fix or enhance project documentation
+title: "[DOCS] "
+labels: ["documentation"]
+---
+
+### 🧩 Description
+What documentation did you update or add?
+
+### 💬 Motivation
+Why was this documentation change necessary?
+
+### ✅ Checklist
+- [ ] Updated README or Wiki
+- [ ] Grammar, formatting, and clarity checked
+- [ ] Linked issues if relevant