I don't think these examples work very well as documentation because you would never use this feature to do this.  You can just use `expect('A').not_to eq('B')` for the first one, for example.

I think where this negation is useful is in compound matcher expressions, e.g.:

``` ruby
expect(array).to include(:foo).and ~include(:bar)
```

This saves you from having to create a `exclude` or `not_include` matcher.

Do you mind updating the examples here in the cuke and in the YARD docs to be more like this?