[web-audio-api] Audio spec still refers to sound-field. (#238)

> Originally reported on W3C Bugzilla [ISSUE-22155](https://www.w3.org/Bugs/Public/show_bug.cgi?id=22155) Fri, 24 May 2013 03:20:30 GMT
> Reported by Ralph Giles
> Assigned to 

The Sound Field panner mode was removed, but the Spatialized section of https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html#Features still refers to it.

Please remove references to 'sound-field' as well. :)

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Reply to this email directly or view it on GitHub:
https://github.com/WebAudio/web-audio-api/issues/238