Closer accuracy to the book

I have added comments for which step in the book, "New Perspectives on HTML, CSS, and Dynamic HTML, 5th Edition" and removed one extra border you had around the subtable.
Merge pull request #2 from dougstrouth/patch-1

Hello Doug! Thanks for your time commenting all steps :) btw, I'm thinking about moving this repository to general repository related to web development. Haven't done it yet but I think it will be good to have everything concentrated in a single place :) Take care