[web-audio-api] Fix the wording in the AudioDestinationNode spec (#20)

> Originally reported on W3C Bugzilla [ISSUE-20841](https://www.w3.org/Bugs/Public/show_bug.cgi?id=20841) Thu, 31 Jan 2013 19:57:26 GMT
> Reported by Ehsan Akhgari [:ehsan]
> Assigned to 

The spec currently says:

"maxNumberOfChannels is the maximum number of channels that this hardware is capable of supporting. If this value is 0, then this indicates that maxNumberOfChannels may not be changed."

I believe the second maxNumberOfChannels should be numberOfChannels.

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https://github.com/WebAudio/web-audio-api/issues/20