Add verbiage to --help

[apiraino]

From comment

Now the help mentions that verbose can be double :)

-v, --verbose...
          Multiple -v options increase verbosity, including the output of the bisection command. The maximum is 2.

@RalfJung does it look better?

[RalfJung]

Thanks! Maybe also mention that the output of the checked program (or whatever term you are using for this) is shown with level 2?

[apiraino]

I am not sure what you were looking for, but I hope the updated text looks now better.

[RalfJung]

I can confirm that -vv does print the program output, in the case of what I was bisecting that was

I will run `"rustup" "component" "add" "rust-src"` to install the `rust-src` component for the selected toolchain. Proceed? [Y/n] error: toolchain 'bisector-nightly-2026-08-04-x86_64-unknown-linux-gnu' does not support components
fatal error: failed to install the `rust-src` component for the selected toolchain

That can be extremely important information to figure out why the bisect does not behave as expected.

[apiraino]

thanks Ralf. I've added a small additional tip also for thr --script parameter

[RalfJung]

That's potentially confusing since -vv shows the output also for the cargo command without --script (I did not use --script when I ran into this).

[apiraino]

ok, reverted to only changing the inline help for -v / -vv parameters.

[RalfJung]

Thanks :)