Pg 64 -- cascading rules: wrong class in first example

[semmypurewal]

Reported by Kasper Meyer:

The class in the CSS is called p.selected, however the class applied to the p element in the actual HTML is called

[semmypurewal]

This has been added to the 'official' errata here:

http://learningwebappdev.com/errata/chapter2/2015/01/04/chapter-2-class-should-be-greeting.html

It has also been corrected in the book draft, so the next ebook update will have the fix.