[ietf-dkim] Internationalized domain names

Eric added the following to base-04:
       Internationalized domain names MUST be punycode-encoded
       [RFC3492].
This is very wrong. The Punycode encoded value does not include the 
"xn--" string.
The text should instead read:
       Internationalized domain names MUST be converted using
       the  steps in section 4 of [RFC3490] using the ToASCII
       function.
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