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ARROW-12034: [Developer Tools] Formalize Minor PRs

Closes #9763 from emkornfield/trivial_prs

Lead-authored-by: Micah Kornfield <emkornfield@gmail.com>
Co-authored-by: emkornfield <micahk@google.com>
Signed-off-by: Micah Kornfield <emkornfield@gmail.com>