Minor touchups to Mix and OTP Chapter 4
Merge pull request #288 from ernie/otp-chapter-4-touchups

Minor touchups to Mix and OTP Chapter 4
Fix "spawning" instead of "spanning"
Merge pull request #289 from trapped/patch-1

Fix "spawning" instead of "spanning"
Fix "behavior" instead of "behaviour"
Merge pull request #291 from trapped/master

Fix "behavior" instead of "behaviour"
Clarifications and touchups to Mix/OTP Chapter 5
Merge pull request #292 from ernie/otp-chapter-5-touchups

Clarifications and touchups to Mix/OTP Chapter 5
Remove spaces in tuples and use String instead of Regex
Another attempt at getting highlight right