pull_request_template.md

What's this PR do?

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How should this be reviewed?

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Any background context you want to provide?

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Relevant tickets

Fixes #

Checklist

• Documentation added for new features/changed endpoints.
• Tested on staging.
• Pinged a PM if this is a larger PR that would benefit from some additional testing love
• Post a message in #phoenix if this includes something that causes a rebuild!