Links added to WCAG2ICT survey

Based on comments asking for links to referenced sections of the document
or to other responses, I've added links to the corresponding issue
responses. Please update your response, if it was blocked by the lack of a
reference.

And if you haven't responded to this survey, please do. It will take a
while.

Responses to Public Comments on WCAG2ICT
    Survey: *http://tinyurl.com/balvfg3*