Fix minor grammatical/syntactical constructions

Hi Todd,

I've gone through and made small grammatical and syntactical changes. I haven't altered any examples or code, just clarified a few sentences to improve readability. This references issue #8. If you have any questions or you'd like to talk about any of these changes, please let me know! Again, I don't want to change the purpose of any of your language, just clarify it a bit.