Readme needs updating for authorization hide / show settings

[Bryan-Lund]

I tried restricting the users that could see the settings by what was in the readme, but it didn't work. I.e. this bit:

public function tools(): array
{
    return [
        NovaSettings::make()->canSee(fn () => user()->isAdmin()),
    ];
}

I had to put Auth:: in front of the user() like so to get it working. Unless i'm missing something, this should be updated:

public function tools(): array
{
    return [
        NovaSettings::make()->canSee(fn () => Auth::user()->isAdmin()),
    ];
}

[kevariable]

it's general example, doesn't mean you gonna take all of an example

[Tarpsvo]

You can create a helper function user() { return Auth::user(); }. 😉