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ARROW-16450: [Go][Docs] Include error handling in csv examples

As per the tests I have added checks in the examples as this tripped me up while dealing with nulls in my CSVs.

Closes #13059 from wolfeidau/arrow-16450-csv-example-godoc

Authored-by: Mark Wolfe <mark@wolfe.id.au>
Signed-off-by: Matthew Topol <mtopol@factset.com>