`user_privs` callback signature looks wrong in documentation

[mrenvoize]

The documentation states the callback signature of the user_privs routine is:

sub {
    my ($app,$extradata) = @_;
    ...
    return $privileges;
}

But the code appears to call it as

sub {
    my ($app,$user,$extradata) = @_;
    ...
    return $privileges;
}

[byterock]

Ok I cleaned this up on the code side it was not impacting anything fortunetly