Update pull request template with resolves keyword

[kyleecodes]

Overview

Our pull request templates do not link their related issues within GitHub. To do this, we must add a resolves keyword as described in these GitHub docs: https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue. There are other options for keywords, but we are using resolves.

Action Items

• [ ] Update /.github/pull_request_template.md to use 'resolves' keyword. The developer should be prompted to link the issue after the resolves keyword in place of "Issue link / number:". Additional directions (hidden or visible) may be added for clarification.

Resources

Markdown Cheatsheet