Made minor revisions and suggestions as to how some parts of the ractive...

....js tutorials could be clarified. Notes are for tutorials 1-9.

I am still adding my comments to better explain my suggestions. 12/24/14
As the comment states, I know that you suggest that the reader read through the statement more than once, but it still isn't clear to me. Is this happening because of ractive.js or is there something else at work here?

Clearly the comment will have to be removed, but I wasn't certain how to pass this impression along without inserting it here.