Clean up edits to WCAG2ICT

Peter did an amazing job of proofreading this doc.

Here are all of his suggested edits with a comments from me on a  few of them 





Gregg
--------------------------------------------------------
Gregg Vanderheiden Ph.D.
Director Trace R&D Center
Professor Industrial & Systems Engineering
and Biomedical Engineering University of Wisconsin-Madison
Technical Director - Cloud4all Project - http://Cloud4all.info
Co-Director, Raising the Floor - International - http://Raisingthefloor.org
and the Global Public Inclusive Infrastructure Project -  http://GPII.net