Fix typos found during review

Nice work - waiting for more chapters to come :-) 

Apart from the minor corrections i'm wondering if the switch from AS7 (referred to in chapters 2 and 3) to EAP (referred to in chapter 11) is intentional or just caused by the time of writing and availability of EAP 6.1.0. Why would someone want to use AS7 in development and delay the switch to EAP till the test environment if using EAP for development is free?