Re: [presentation-api] Define that "TV" should appear as token for UA-string when presentation API is used to render on TV

See [discussion at 
TPAC](http://www.w3.org/2016/09/22-webscreens-minutes#ins12)

**PROPOSED RESOLUTION:** For #303, add a note about feature detection 
through the `receiver` attribute, no guideline on the UA string.

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Received on Monday, 26 September 2016 12:16:34 UTC