[web-audio-api] API Overview is missing some interfaces (#194)

> Originally reported on W3C Bugzilla [ISSUE-21514](https://www.w3.org/Bugs/Public/show_bug.cgi?id=21514) Tue, 02 Apr 2013 12:26:22 GMT
> Reported by Olivier Thereaux
> Assigned to 

Per discussion at Audio WG f2f 2013-03-26

During a review of the "API Overview" section it was noted that the Oscillator, WaveShaper and possibly other interfaces were missing from the list.

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https://github.com/WebAudio/web-audio-api/issues/194