[whatwg/url] Provide a succinct grammar for valid URL strings (#479)

As an occasional standards-user, the lack of a succinct expression of the grammar for valid URL strings is rather frustrating. It makes it rather difficult to follow what's going on and, in particular, to work out whether a given thing is a valid URL. A grammar in EBNF or a similar form would be greatly appreciated and make this spec significantly easier to understand.

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