[whatwg/url] Clarify language around scheme state with state override in basic URL parser (#315)

In 11.(scheme state).2.1:
> 1. If _url_’s scheme is a special scheme and _buffer_ is not, then return.
> 1. If _url_’s scheme is not a special scheme and _buffer_ is, then return.

This is not unambiguously clear that _buffer_ is to be checked for being a special scheme.

cc @domenic 

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