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Joris Van den Bossche authored and GitHub committed 9d56569774a
MINOR: [Docs] Remove mention of JIRA issues in the contributing PR checklist (#44091) ### Rationale for this change We no longer have any remaining JIRA issues, so this sentence can be removed. Authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com> Signed-off-by: Sutou Kouhei <kou@clear-code.com>