docs: add to pr template tf source tip

Author: iru

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,6 +1,15 @@
 <!--
 Thank you for your contribution!
 
+## Testing your PR
+
+You can pinpoint the pr changes as terraform module source with following format 
+
+```
+source                    = "github.com/sysdiglabs/terraform-aws-secure-for-cloud//examples/organizational?ref=<BRANCH_NAME>" 
+```
+
+
 ## General recommendations
 Check contribution guidelines at https://github.com/sysdiglabs/terraform-aws-secure-for-cloud/blob/master/CONTRIBUTE.md#contribution-checklist
 
@@ -11,12 +20,12 @@ For a cleaner PR make sure you follow these recommendations:
 
 ## Checklist
 
-- [ ] If `test/fixtures/*/main.tf` files are modified. I have updated:
+- [ ] If `test/fixtures/*/main.tf` files are modified, update:
     - [ ] the snippets in the README.md file under root folder.
     - [ ] the snippets in the README.md file for the corresponding example.
-- [ ] If `examples` folder are modified. I have updated:
+- [ ] If `examples` folder are modified, update:
     - [ ] README.md file with pertinent changes.
     - [ ] `test/fixtures/*/main.tf` in case the snippet needs modifications.
-- [ ] If any architectural change has been made, I have updated the diagrams.
+- [ ] If any architectural change has been made, update the diagrams.
 
 -->