Adding documentation for HTMLBook comments.
Adding documentation for HTMLBook comments.

mushroomgithub/HTMLBook,macmillanpublishers/HTMLBook,gitenberg-dev/HTMLBook,oreillymedia/HTMLBook,oreillymedia/HTMLBook,oreillymedia/HTMLBook,macmillanpublishers/HTMLBook,mushroomgithub/HTMLBook,gitenberg-dev/HTMLBook,mushroomgithub/HTMLBook,macmillanpublishers/HTMLBook,gitenberg-dev/HTMLBook