Fix phpdoc type in promptForMissingArgumentsUsing

[billypoke]

in #58565 another of the new types is for PromptsForMissingInput::promptForMissingArgumentsUsing. When using a callable to fully control the missing argument prompt such as using laravel/prompts, the union return type isn't quite correct. When specifying a callable return type, multiple return types should be wrapped in parentheses, not the entire \Closure block.

PHPStan docs ref - https://phpstan.org/writing-php-code/phpdoc-types#callables

PHPStan repros here:
Error (current phpdoc) - https://phpstan.org/r/a1815f96-87f0-45eb-920a-3759e941e682
Fixed - https://phpstan.org/r/8d1bd604-6a48-4e7e-8d60-17a76f420ebf

Here's the actual code that is triggering the error:

protected function promptForMissingArgumentsUsing(): array
{
    return [
        'result' => fn (): string => textarea(
            'Enter the payload',
            required: true,
        ),
    ];
}

PHPStan error:

Method App\Console\CommandName::promptForMissingArgumentsUsing() should return array<string,
         array{string, string}|bool|(Closure(): array<int|string>)|int|string> but returns array{result: Closure(): string}.