Some spelling fixes

Two commits are included here, one fixing the spelling of "eighths" and the other fixing a little doc typo. Sometimes having another set of eyes look over your writing works wonders :smiley: 

I was confused about this line, however:

> NOTE: Your browser may display some of the characters in a slightly different
manner than you browser.

Do you mean to say that it will look different in my browser than in yours, or that it will look different in my terminal than in my browser?

Anyway, great job on this altogether!