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

I'm not in a huge hurry, just like to make things neat and tidy.

Marking the encoding algorithm non-normative would be helpful - it doesn't stop it from being self contained for reference within the document. I suppose it would be okay to keep it normative but add a statement along the lines of "This is [identical to|based on] what is specified in 10646".

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