docs: more intuitive use of callr given a fast and slow task

[hypebright]

Hi @laresbernardo, thanks for contributing!

Can you tell me why you want to add a fast task? Is it to demonstrate the fact that the session does not freeze and remains free?

If that's the case, we can also add a clock, similar to the more extensive example here - keeps the examples consistent :)

[hypebright]

I might change the folder structure - I must admit these more extensive (and perhaps better) examples are a bit hidden

[laresbernardo]

Can you tell me why you want to add a fast task? Is it to demonstrate the fact that the session does not freeze and remains free?

Exactly. You can click on that button as many times as you want and will work as expected while waiting for the long task. And the order doesn't matter.

If that's the case, we can also add a clock (...)

Sure, submitting a quick new commit.

[hypebright]

Thanks @laresbernardo!