ARROW-14055: [Docs] Add canonical url to the sphinx docs
ARROW-14055: [Docs] Add canonical url to the sphinx docs

Closes #11200 from jorisvandenbossche/ARROW-14055-canonical-url

Authored-by: Joris Van den Bossche <36c737f86d71d8ee1ddeb1e5c83102ee5de8f97c@gmail.com>
Signed-off-by: Sutou Kouhei <73218711cdd5d5c30ac66da3cc4d9d9204caf34b@clear-code.com>

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