[whatwg] Change of copyright notice

[dolphinling]

Ian Hickson wrote:
> It took a while, but we finally have all the lawyers happy (to the last 
> piece of punctuation) and the header of the WHATWG specs has been updated 
> to read:
> 
>    (c) Copyright 2004 Apple Computer, Inc., Mozilla Foundation, and Opera 
>    Software ASA.
>    You are granted a license to use, reproduce and create derivative works 
>    of this document.

Yay!

> I shall now be resuming work responding to comments and editing the spec.

More yay! :-)