[web-audio-api] Clarify the range of valid AnalyserNode.fftSize values (#191)

> Originally reported on W3C Bugzilla [ISSUE-21451](https://www.w3.org/Bugs/Public/show_bug.cgi?id=21451) Mon, 01 Apr 2013 02:55:41 GMT
> Reported by Ehsan Akhgari [:ehsan]
> Assigned to 

WebKit only allows power of two values between 32 and 2048.  If that is intentional, perhaps we should spec it.

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https://github.com/WebAudio/web-audio-api/issues/191