Typos

10:"revision a Chef code" -> "Chef code and Recipes"
13:"with such content:"  # Could be improved, but I currently have no suggestion.
22:"we install a required" -> "we install any required"
30:"But why do we need these rubygems?"  # No answer is provided here? Possible missing segment, or misplaced line?

48: Berkshelf section had a few segments.