URL-SYNTAX: update IDNA section for WHATWG spec changes #7026
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WHATWG URL has dictated the use of Nontransitional Processing (IDNA 2008) for several years now (since whatwg/url#240). Chrome (and derivatives) still use Transitional Processing, but Firefox and Safari have both switched.
Also document the fact that winidn functions differently from libidn2 here.