ARROW-11373: [Python][Docs] Add example of specifying type for a column when reading csv file
ARROW-11373: [Python][Docs] Add example of specifying type for a column when reading csv file

Closes #9386 from jaroszan/doc_improvement_ARROW-11373

Lead-authored-by: Szangin <221fdea5a2c020c6fed5e765c17fbd76689940bf@teliacompany.com>
Co-authored-by: David Li <dc24f9cfc84fb1675ce65c8444a2c3e2f0e5f297@gmail.com>
Signed-off-by: David Li <dc24f9cfc84fb1675ce65c8444a2c3e2f0e5f297@gmail.com>

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