Ch.7 p80 - expected is not used in require_login.rb

[JunichiIto]

In Ch.7 p80, there are actual and expected in require_login.rb, but expected is not used in it. This might lead to confusing. So adding some description would be helpful for understanding.

E.g.
We check to see if the actual, expected value we're passing to the matcher (in this case, response as actual only) does what we expect it to (redirect to our login form).

This issue was reported from one of our readers.

[ruralocity]

I've never been happy with this contrived example. I got rid of actual, expected for now and changed the link for more information to the Relish documentation. I want to revisit this and come up with a better example for the next major release.