minor text changes

All but one of the changes here are straightforward typos, etc.

However, after reading through #40, I'm undecided about my change to surround "<name>.node" in back-ticks. @dtudury makes a valid point that back-ticks are used to represent syntax used within files.

If the #40 change is preferred, I can adjust this pull request accordingly. I've left the back-ticks change here simply so that it can be discussed.