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.
As it was, we would be waiting for an IP to +1 in order to push a PR through. This is not practical. Either they are part of the standard dev +1 or we don't wait for the +1 but still expect an IP to look into it as part of their development.