Merge pull request matplotlib#25737 from chahak13/patch-1

Update PULL_REQUEST_TEMPLATE.md to include issue cross-reference.

Author: QuLogic

Diff for: .github/PULL_REQUEST_TEMPLATE.md

@@ -3,6 +3,8 @@
 ## PR Checklist
 
 <!-- Please mark any checkboxes that do not apply to this PR as [N/A]. -->
+**Linked Issue**
+- [ ] Added "closes #0000" in the PR description to link it to the original issue.
 
 **Documentation and Tests**
 - [ ] Has pytest style unit tests (and `pytest` passes)