Release candidate verifying script seems work on macOS

[waynexia]

Describe the bug
In this document it says

Currently this only works on Linux (patches to expand to macOS welcome!).

I think this document might be outdated? I can run the script on macOS (Intel chip, Catalina). Or there is some other environment that can't run it.

To Reproduce
n/a

Expected behavior
n/a

Additional context
BTW, I'm wondering whether this issue can be tagged as Bug. Maybe we need another type like "Question" or something like that?

[alamb]

@waynexia i also run the verification script on mac without issue I think the comment is outdated

[alamb]

FWIW the question label already exists (I added it to this issue). It isn't clear to me if everyone can add labels to issues in arrow-rs. Does it work for you @waynexia ?

Perhaps we could add a template for a "question" to make it easier for people to file such questions: https://github.com/apache/arrow-rs/tree/master/.github/ISSUE_TEMPLATE

[waynexia]

Thanks @alamb!

I cannot edit labels. It seems like this operation requires write permission to this repo or something.

I opened #649 to add the "question" template, please check it out 😃