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ARROW-6328: [Developer][crossbow] Click.option-s should have help text

Click.option-s should have `help` text

## What?
Add `help` text to click.option

## Why?
Click.option should ideally have a `help` text defined to be useful.

Closes #5159 from ulziibay/uo/add_help_to_option and squashes the following commits:

0c22b76fa <Wes McKinney> Remove unneeded help sentence
d37af300c <Ulzii Otgonbaatar> address line length
a96241ae8 <Ulzii Otgonbaatar> Click.option-s should have help text

Lead-authored-by: Ulzii Otgonbaatar <ulzii@returntocorp.com>
Co-authored-by: Wes McKinney <wesm+git@apache.org>
Signed-off-by: Wes McKinney <wesm+git@apache.org>