Fix argument type bool -> bool?

[Likenttt]

Description

What your Pull Request change ? Just fix the doc argument type bool -> bool? Or we will get The argument type 'void Function(bool)' can't be assigned to the parameter type 'void Function(bool?)?'.dart[argument_type_not_assignable](https://dart.dev/diagnostics/argument_type_not_assignable)

Checklist

Before creating any Pull Request, confirm that it meets all requirements listed below by checking the relevant checkboxes ([x]).

• [x] 📕 I read the Contributing page.
• [x] 🤝 I match the actual coding style.
• [x] ✅ I ran flutter analyze without any issues.

Breaking Change

• [ ] 🛠 My feature contain breaking change.

If your feature break something, please detail it

[Likenttt]

Due to Null-safety