Re: [encoding] Clarify scope of document in preface (#10)

@Ms2ger good point - everywhere there's a 'copy and include' pattern the original (and presumably definitive + already implemented) should be referenced. 

If there's a reverse engineering scenario to deal with a closed or non-existent "standard" then it makes sense to define something here.

It looks like the intended audience is anyone creating a new UA, maintaining an existing UA, or defining new protocols and formats. The obvious danger is that existing protocols, formats and content will break - this spec is clearly taking pains to avoid that situation, so it would be worth making the derivations clear and obvious, as well as any deltas.

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