No docs on values in format string for Arrow.format()

[metaperl]

The user guide docs on format do not document the various arguments that can be provided. The API guide also lacks such information.

[metaperl]

By contrast note that Pendulum has a section on what tokens can be supplied.

[jadchaar]

Hi @metaperl we have documentation here: https://arrow.readthedocs.io/en/latest/guide.html#supported-tokens. That said, this can likely be made more obvious. PRs are welcome if you'd like to take this improvement on!