ARROW-2564: [C++] Replace deprecated method in documentation
ARROW-2564: [C++] Replace deprecated method in documentation

Tutorial update to keep working code.
https://issues.apache.org/jira/browse/ARROW-2564

Author: Kendall Willets <kendall@willets.org>

Closes #2020 from KWillets/master and squashes the following commits:

e6da7f1f <Kendall Willets> fit coding style (?)
e173ae43 <Kendall Willets> remove deprecated method

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