MINOR: [C++] Fix typo in dataset arg validation (#14150)
MINOR: [C++] Fix typo in dataset arg validation (#14150)

Authored-by: Will Jones <657f960c862bff0a29dc3b2fdf81dc9f19866f2e@gmail.com>
Signed-off-by: Yibo Cai <e732a3f0de35687e82bda0008a72e443d2f69704@arm.com>
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