[web-audio-api] Add detail of connecting audio node to non audio node (#40)

> Originally reported on W3C Bugzilla [ISSUE-21538](https://www.w3.org/Bugs/Public/show_bug.cgi?id=21538) Tue, 02 Apr 2013 16:00:50 GMT
> Reported by Olivier Thereaux
> Assigned to 

Per discussion at Audio WG f2f 2013-03-26

In section "The connect to AudioParam method", add detail of connecting audio node to non audio node. An explanation on why would you do it (LFO example) could be added to the graph routing introduction.

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https://github.com/WebAudio/web-audio-api/issues/40