Commits
Joris Van den Bossche authored and Sutou Kouhei committed 6f84badd965
MINOR: [Docs] Fix sphinx build warnings Closes #12900 from jorisvandenbossche/doc-minor Authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com> Signed-off-by: Sutou Kouhei <kou@clear-code.com>