Update for scalaz 7.1 (days 0 to 10)

Minor updates... A couple of syntax errors, typo's and changes from scalaz 7.0 to 7.1. Will get onto the final chapters (days) soon.  ;-)
This changes the url to point to the one provided on the scalaz gitgub readme which links you to all the documentation versions so you can choose 7.0, 7.1, 7.2.? etc.