ARROW-13455  [C++][Docs] Typo in RecordBatch::SetColumn
ARROW-13455  [C++][Docs] Typo in RecordBatch::SetColumn

Fix typo in SetColumn docs

Closes #10810 from rvernica/patch-3

Authored-by: rvernica <0af67f2c90ddd7160477dfdf123004878339b1fb@gmail.com>
Signed-off-by: Antoine Pitrou <9359a4d812173b65a3a0094cd86363e79731a3c2@python.org>

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