ACTION-1199:  User Agents SHOULD note author errors in console.

Based on a resolution at the 26-Aug-2014 AAPI meeting [1], with
repsect to to "Author Errors" section, specifically where required
aria attributes are missing, removed the sentence:
    "User agents SHOULD report these errors via their console".

These kinds of errors should be reported via a validation tool.

[1] http://www.w3.org/2014/08/26-aapi-minutes.html#item01.