Roger's suggested changes to PR template

These are ideas Roger had for the template. I'll let him elaborate but I think the gist of it is that more people are checking against the Jira, and ensuring we're not blocked waiting for IPs to complete code review before merging.
The point of reviewing it by someone else than the submitter is to validate that the work matches the JIRA. It is easy sometimes to miss the point of what was being asked. Best to double check it meets the requirements before it goes into test by PO/Tester.