Update PULL_REQUEST_TEMPLATE.md (#1843)

Author: RanVaknin

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,3 +1,5 @@
-For changes to files under the `/model/` folder, and manual edits to autogenerated code (e.g. `/service/s3/api.go`) please create an Issue instead of a PR for those type of changes.
+For changes to files under the `/codegen/aws-models` folder, and manual edits to autogenerated code (e.g. `/service/s3/api.go`) please create an Issue instead of a PR for those type of changes.
 
 If there is an existing bug or feature this PR is answers please reference it here.
+
+To help speed up the process and reduce the time to merge please ensure that `Allow edits and access to secrets by maintainers` is checked before submitting your PR. This will allow the project maintainers to make minor adjustments or improvements to the submitted PR, allow us to reduce the roundtrip time for merging your request.