[web-audio-api] Remove AudioContext constructor code example (#200)

> Originally reported on W3C Bugzilla [ISSUE-21517](https://www.w3.org/Bugs/Public/show_bug.cgi?id=21517) Tue, 02 Apr 2013 12:39:29 GMT
> Reported by Olivier Thereaux
> Assigned to 

The AudioContext section currently shows example code:

«
  An AudioContext is constructed as follows:
   var context = new AudioContext();
»

The example should be removed, as it duplicates information in the IDL.

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https://github.com/WebAudio/web-audio-api/issues/200