Added example for template checkboxes

.github/ISSUE_TEMPLATE/bug_report.md

@@ -22,7 +22,7 @@ about: Report broken or incorrect behaviour
 
 ### Checklist
 
-<!-- Put an x inside [ ] to check it -->
+<!-- Put an x inside [ ] to check it, like so: [x] -->
 
 - [ ] I have searched the open issues for duplicates.
 - [ ] I have shown the entire traceback, if possible.

.github/PULL_REQUEST_TEMPLATE.md

@@ -4,7 +4,7 @@
 
 ### Checklist
 
-<!-- Put an x inside [ ] to check it -->
+<!-- Put an x inside [ ] to check it, like so: [x] -->
 
 - [ ] If code changes were made then they have been tested.
     - [ ] I have updated the documentation to reflect the changes.