updated 'Training' pages

Updates to all training pages as discussed in EO July-Aug 2012 are attached

Refer http://www.w3.org/WAI/EO/wiki/Developing_Training_Notes#To_do_overall

updates for related Changelogs to follow

-- 
Andrew Arch
  Canberra, Australia

“Man does not cease to play because he grows old.
    Man grows old because he ceases to play.”
George Bernard Shaw