[12.x] Adjust docblock for formatActionForCli

[jackbayliss]

This was causing static analysis issues:

https://github.com/laravel/framework/actions/runs/21527588688/job/62035125987

Which I retriggered here:
https://github.com/jackbayliss/framework/actions/runs/21529548767/job/62041765393

The formatActionForCli method can actually be null, which is why we have ?? ''

framework/src/Illuminate/Foundation/Console/RouteListCommand.php

Line 406 in a16a88b

str_replace(' ', ' › ', $action ?? ''),

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[jackbayliss]

This is failing due to:

Passing floats to BigNumber::of() and arithmetic methods is deprecated and will be removed in 0.15. Cast the float to string explicitly to preserve the previous behaviour.

However, static analysis seems to pass re: https://github.com/laravel/framework/actions/runs/21530087609/job/62043587891?pr=58562

So should be good for review 🖖🏻

[shaedrich]

Thanks for fixing—I encountered that as well 👍🏻