General typo fixes.

fixing some typos on the document. trying to get a grasp of the whole idea whilst correcting some typing mistakes.

I have a question regarding a phrasing I was correcting. it is the "No reward for appliance." Does this mean that the nodes do not get rewards for applying the "law" or that there is no reward for complying with the law.

Charles.

PD: this is my first pull request to a public repo, If I did something wrong please tell me so I can work on my git fu.