Fix incorrect code to synopsis.

To run code

```perl
use strict;
use warnings;

{
    package My::Role;
    use MooseX::Role::Strict;
    sub conflict {}
}
{
    package My::Class;
    use Moose;
    with 'My::Role' => { -excludes => 'conflict' } ;
    sub conflict {}
}
```

Error:
Can't use string ("conflict") as an ARRAY ref while "strict refs" in use at
/usr/lib/perl5/Moose/Meta/Role/Application.pm line 34.

Valid:

```perl
use strict;
use warnings;

{
    package My::Role;
    use MooseX::Role::Strict;
    sub conflict {}
}
{
    package My::Class;
    use Moose;
    with 'My::Role' => { -excludes => [ 'conflict' ] } ;
    sub conflict {}
}
```