Call for review: Don't allow description track to satisfy media SCs #1665

Hey folks,

This PR removes the description track as a valid method to provide audio
description for various 1.2.x success criteria. This call for review ends
on September 2nd. If you have any comments, please leave them on the pull
request before that time:
https://github.com/act-rules/act-rules.github.io/pull/1665

Kind regards,

-- 
*Wilco Fiers*
Axe-core product owner - Facilitator ACT Task Force - Co-chair ACT-Rules