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Antoine Pitrou authored and Wes McKinney committed 1f42ac0ff0b
ARROW-9428: [C++][Doc] Update buffer allocation documentation Use Result-returning AllocateBuffer() version in example. Also improve cross-referencing in some places. Closes #7731 from pitrou/ARROW-9428-buffer-allocation-doc Authored-by: Antoine Pitrou <antoine@python.org> Signed-off-by: Wes McKinney <wesm@apache.org>