ARROW-13036: [Doc] Mention recommended file extension(s) for Arrow IPC
ARROW-13036: [Doc] Mention recommended file extension(s) for Arrow IPC

See JIRA

Closes #10512 from westonpace/feature/ARROW-13036--doc-mention-recommended-file-extension-s-for-ar

Authored-by: Weston Pace <0dd0706858a011bb30a3fd82b71cee4f9094c502@gmail.com>
Signed-off-by: Antoine Pitrou <9359a4d812173b65a3a0094cd86363e79731a3c2@python.org>

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